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What number is subtracted from both side of x plus 5 equals 15 when solving for x?
5 is subtracted from both sides of the equation. x + 5 = 15: x+5 (-5) = 15 (-5);
when you subtract 5 on the left side of the equal sign the +5 (-5) cancel each other out to equal 0; when you do something to one side of the equal sign you must do the same thing to the other side; so subtract 5 from 15, and you are left with x + 0 = 10
which is x = 10.
When solving for x, you want to end up with x all alone on one side of the equal sign. You have to subtract (or add) the total sum on the x side to both sides of the equal sign.
5 Additional Examples when solving for x:
x + 7 = 13: you have to subtract 7 from both sides of the equal sign
x + 7 (-7) = 13 (-7) so x = 6
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x + 2 + 4 = 20: you have to subtract 2 and 4 from both sides of the equal sign
x + 2 + 4 (- 2) (- 4) = 20 (-2) (-4), so x = 14
a shortcut would be to subtract 6 from both sides of the equal sign since 2+4=6
x + 2 + 4 (-6) = 20 (-6) so x = 14
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x - 3 = 18: you have to add 3 to both sides of the equal sign
x - 3 (+3) = 18 (+3) so x = 21
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x - 5 - 4 = 17: you have to add 5 and 4 to both sides of the equal sign
x - 5 - 4 (+5) (+4) = 17 (+5) (+4), so x = 26
a shortcut would be to add 9 to both sides of the equal sign since -4 - 5 = -9
x - 5 - 4 (+9) = 17 (+9) so x = 26
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x + 7 - 3 = 19: you have to subtract 7 and add 3 to both sides of the equal sign
x + 7 - 3 (-7) (+3) = 19 (-7) (+3) so x = 15
a shortcut would be to subtract 4 from both sides of the equal sign since 7 - 3 = 4
x + 7 - 3 (-4) = 19 (-4) so x = 15
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I hope this helps you understand. You do not have to use the parentheses when adding or subtracting on either side of the equal sign. I just used them to make it easier to read.
What else can I help you with?
What is 16 subtracted from a number equals 56?
-40
What is x if 17 equals x plus 51?
If x + 51 equals 17, then x must be negative. (If we are going to add 51 to some number and only get 17, an number less than 51, then we had to start at a negative number for this to happen.) Let's work through this one.x + 51 = 17x = 17 - 51 (we subtracted 51 from both sides of the equation)x = -34 (we have arrived at the answer)
What number must be subtracted from both the numerator and the denominator of the fraction two thirds to get a fraction of one quarter?
5/12
Find a number such that When 15 is subtracted form 7 times the number the result is 10 more than twice the number?
If we call the number that we're looking for "x", then we can translate the question like this:When 15 is subtracted from 7x, the result equals 2x + 10Or:7x - 15 = 2x + 10Then it's a simple matter of simplifying the equation. Group like terms on either side of the equal operator:7x - 2x = 10 + 15Then add them together:5x = 25And factor five out of both sides:x = 5Giving you the answer.
What is the first step in solving the equation 7d plus 1 equals 8 for d?
Subtract 1 form both sides of the equation
What is the property that you can subtract the same number from both sides of an equation the new equation will have the same solution?
The property is: If equals are subtracted from equals, the results are equal.
What is 16 subtracted from a number equals 56?
-40
What number can be subtracted from both the numberator and the denominator of thirty four over fifety four?
Any number can be subtracted. To reduce the fraction, you need to divide. In this case, 2 can be taken out. 34/54 = 17/27
What minus 14 equal -6?
20
How do you solve the equation y equals x squared?
If you are solving for y, it is fine. If you are solving for x, divide both sides by x and the equation should be x = y/x
Why does a rational number plus an irrational number equal an irrational number?
from another wikianswers page: say that 'a' is rational, and that 'b' is irrational. assume that a + b equals a rational number, called c. so a + b = c subtract a from both sides. you get b = c - a. but c - a is a rational number subtracted from a rational number, which should equal another rational number. However, b is an irrational number in our equation, so our assumption that a + b equals a rational number must be wrong.
What is x if 17 equals x plus 51?
If x + 51 equals 17, then x must be negative. (If we are going to add 51 to some number and only get 17, an number less than 51, then we had to start at a negative number for this to happen.) Let's work through this one.x + 51 = 17x = 17 - 51 (we subtracted 51 from both sides of the equation)x = -34 (we have arrived at the answer)
What number must be subtracted from both the numerator and the denominator of the fraction two thirds to get a fraction of one quarter?
5/12
What is a method for solving a system of linear equations in which you multiply one or both equations by a number to get rid of a variable term?
It is called solving by elimination.
Find a number such that When 15 is subtracted form 7 times the number the result is 10 more than twice the number?
If we call the number that we're looking for "x", then we can translate the question like this:When 15 is subtracted from 7x, the result equals 2x + 10Or:7x - 15 = 2x + 10Then it's a simple matter of simplifying the equation. Group like terms on either side of the equal operator:7x - 2x = 10 + 15Then add them together:5x = 25And factor five out of both sides:x = 5Giving you the answer.
What is the first step in solving the equation 7d plus 1 equals 8 for d?
Subtract 1 form both sides of the equation
What states that the solution to an equation does not change when the same number is subtracted from both sides of the equation?
This is the rule of addition which states that if equals are added to equals, the sum is equal. It also applies to subtraction. The rule of multiplication is similar: if equals are multiplied by equals , the result is equal. It also applies to division. These are the basic rules of algebra ; In fact that is what algebra means, from the Arabic "al jabr" : what is done to one side, if done to the other, nothing is changed.
