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because you undo the operation in the equation= to undo subtraction you add

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โˆ™ 2009-12-09 00:35:23
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Q: Why would you use addition to solve a subtraction equation?
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Related questions

What does the variable represent in an addition or subtraction expression?

it is the number you would use to solve the problem

How is the addition and subtraction equality used in linear equations?

in an equation like y=5x+3 the 3 would be the y-intercept

Which property of equality is used to solve the equation k - 21 equals -11?


Why is it we don't have any properties of subtraction and division?

Because subtraction is addition and division is multiplication. So, subtraction would fall under the properties of addition and division would come under the properties of multiplication.

Why are subtraction addition multiplication division called reciprocal or inverse operations?

The inverse operation of addition would be subtraction. The inverse operation of subtraction would be addition. The inverse operation of multiplication is division and the inverse operation of division is multiplication. It is called the inverse operation because you are reversing the equation. If you add, subtract, multiply, or divide the same number on each side of the equation, then the equation would still be true. As long as you are doing the same thing on BOTH side of the equation. The reciprocal is used for dividing fractions. All you have to do for finding the reciprocal of a fraction is flip the fraction. Ex: The reciprocal of 1/4 is 4. The reciprocal of 5/8 is 8/5. You can check by multiplying the two fractions. It will equal to one if you did it right. I hope this helped a little bit.

What are the factors of addition?

"Factor" is normally applied to multiplication and division, not addition and subtraction, but the analogues in addition would be the numbers being added.

Are real numbers closed under addition and subtraction?

Real numbers are closed under addition and subtraction. To get a number outside the real number system you would have to use square root.

Do addition and subtraction have the same operations?

No,, they do not. Why would anyone have two operations that are the same?

How do you solve 4 - -2?


Solve the equation 7x 42 what is X?

if the equation was 7x = 42. The answer would be x = 6

When would you use a number line in life?

When you are starting to learn about numbers, their addition and subtraction.

In solving an equation with more than one operation you must first add then divide?

Multiplication and division come first, then addition and subtraction. For example: 4 + 2 X 3 + 6 = 16 First you multiply 2 X 3, to get 6, and then you add them, left to right 4 + 6 + 6 = 16. The answer IS NOT 54 and the answer IS NOT 30. The same rule applies with division; division comes before addition or substraction. If there is both division and multiplication and/or addition and subtraction, you resolve the multiplication and division left to right first, then resolve the addition and subtraction left to right. It is generally better to user parentheses to illustrate exactly what you mean. For example, the above equation would be easier read if it was written 4 + (2 X 3) + 6. Or, if you really had wanted the addition first, (4 + 2) X (3 + 6). Then it is quicker and easier for the reader to see what is going on in equation.

Why would you want to simplify an algebraic equation?

Simplifying an equation often helps solve it.

Is order of subtraction and addition performed last?

BODMAS would say that addition is before subtraction. There is a main code "DMAS", which prove that: D:Divide M:Multiplication A:Addition S:Subtraction It proves that Addition is before Subtraction. HOPE U LIKE THAT:)

How do you solve an equation with a variable that is a fraction?

You solve the equation the same way as you would any other equation. Whether the variable is a fraction or otherwise will only become clear once you solve the equation. In other words, you don't initially KNOW whether the solution will be a fraction or not.

Which equation would you use to solve the following word problem?

There was no word problem, so it would be a null equation.

Which property of equality would you use to slove the equation 14x equals 35?

The subtraction of equality.

What is expression in math terms?

It is a collection of terms which are combined using various mathematical operations such as addition, subtraction, multipplication, division, power, inverse, trigonometric functions etc. It does not have an equality of inequality relationship - which would make it an equation or inequality.

How would 2 pond 60 be shown on a calculator display?

The answer will depend on how the information was entered - in pounds (or ponds) or in pennies, what the operations were - addition/subtraction or -multiplication/division).The answer will depend on how the information was entered - in pounds (or ponds) or in pennies, what the operations were - addition/subtraction or -multiplication/division).The answer will depend on how the information was entered - in pounds (or ponds) or in pennies, what the operations were - addition/subtraction or -multiplication/division).The answer will depend on how the information was entered - in pounds (or ponds) or in pennies, what the operations were - addition/subtraction or -multiplication/division).

Why are numbers combined with operations of addition subtraction multiplication and division?

Because if you did not combine them then you would have only one number: the number 1. You would not have 2 which is 1+1 and similarly no larger positive integers. Nor would you have negative integers which are obtained by subtraction. There would be no other rational numbers which are obtained by division. All in all, arithmetic would be pretty much useless.

What is the quadratic equation used for?

It is used to solve quadratic equations that cannot be factored. Usually you would factor a quadratic equation, identify the critical values and solve, but when you cannot factor you utilize the quadratic equation.

How do you use order of operations?

Order of operations is very helpful in solving many problems. First, you check for parenthesis, then exponents, then multiplication/division, then subtraction/addition. For example with the problem 2+3(9-2)+(3^2), you would first look for parenthesis from left to right. The first parenthesis is (9-2) and therefore you solve the contents of those parenthesis, resulting in (7). So now your problem reads 2+3(7)+(3^2). Your second set of parenthesis (from left to right) is (3^2), which results in 9 when solved. Now, your equation is 2+3(7)+(9). There are no longer any parenthesis that are solvable (the contents of all the parenthesis are all simplified), therefore you check for multiplication/division. When a number is next to another number (or variable for that matter) without any operation signs like addition, subtraction, multiplication, or division, you will multiply those numbers. (aka 3(7)=3 times 7). So, your only (and inherently first) multiplication operation in the equation is 3(7), which results in 3 times 7, which is equal to 21. Now, your equation reads 2+21+9. You now look for subtraction/addition from left to right. The first addition problem in the equation is 2+21which results in 23, meaning your equation now looks like this: 23+9. Your next addition in the equation is 23+9, which simplifies to 32. Therefore, 2+3(9-2)+(3^2)=32.

Why it happens in maths that addition and subtraction makes subtraction?

Ok i can see where you would have trouble with this. When i first started Algebra, i wasn't quite sure how this worked. Here are some examples: 2-+2=0 the subtraction sign cancels the addition out. (2-2 is the same thing) 2- -2= 4 the two subtraction signs make an addition sign. (2+2 is the same thing) I hope i could help you.

How is estimation helpful when adding and subtracting decimals?

It is difficult to answer the question because, for addition or subtraction, it is often easier to obtain the exact answer! If you line up the decimal points and then follow the rules of addition or subtraction - exactly as they would apply to whole numbers - you will get the correct answer!Estimation may be useful to check your answer if you are poor at addition or subtraction of integers. But, if that is the case, your estimate is equally likely to be wrong!

How do you solve a radical equation with a variable beside the number inside of the radical?

Square both sides of the equation to get rid of the radical sign. Then just solve as you normally would. Good luck! :-)