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Why is necessary to substitute the solution back into the equation?
ThomasAlenDeLeon
The equation needs an answer for it to be an equation in the 1st place. You bring the answer back to equation to show it's complete
Wiki User
∙ 11y ago
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How do you solve log sub 9 parenthesis a over 27 closed parenthesis equals x minus 2?
Your equation has two variables in it ... 'a' and 'x'. So the solution is a four-step process: 1). Get another independent equation that relates the same two variables. 2). Solve one of the equations for one of the variables. 3). Substitute that into the other equation, yielding an equation in a single variable. Solve that one for the single variable. 4). Substitute that value back into the first equation, and solve it for the second variable.
What are the steps to solve a whole number equaiton?
To solve a whole number equation, follow these steps: Simplify both sides of the equation by combining like terms. Use inverse operations to isolate the variable on one side of the equation. Perform the necessary operations to solve for the variable. Check your solution by substituting the value back into the original equation to ensure it satisfies the equation.
How do you know when an equation has no solution?
when you're really good in that kind of equation, but cannot, no matter what u do, CANNOT figure it out! when you look it up and can't find the answer in the back of the book. It depends on what kind of problem it is.
How do we verify answers in maths?
To verify your answers in a math problem it is best to work backwards. For example if you were dividing 4 by 2 and you get the answer 2 you would check it by multiplying 2 time 2. If it is an algebraic equation you can simply substitute the answer back into the original equation. Example with the problem 2X + 1 = 5 and you get the answer X=2 you simply substitute 2 back into the original problem for X...... 2(2) + 1 = 5
How do you check to see if your solution is correct in an equation?
Plug your answer back into the original equation.Example:3x+15=21x=23(2)+15=21
How do you determine whether a number is a solution of an equation?
Substitute the value found back into the equation, evaluate the expressions and see if the resulting equation is true.
Why is it possible to check the solution to any equation?
If you found the value of x that is a solution to an equation, you want to substitute that value back into the original equation, to check that it indeed satisfies the equation. If it does not satisfy the equation, then you made an error in your calculations, and you need to rework the problem.
How do you check the solution to an equation?
plug your solution back into the original equation and work it out again
How do you solve log sub 9 parenthesis a over 27 closed parenthesis equals x minus 2?
Your equation has two variables in it ... 'a' and 'x'. So the solution is a four-step process: 1). Get another independent equation that relates the same two variables. 2). Solve one of the equations for one of the variables. 3). Substitute that into the other equation, yielding an equation in a single variable. Solve that one for the single variable. 4). Substitute that value back into the first equation, and solve it for the second variable.
How do you check your solution with inequalities?
1) Replace the inequality signs in the solution and in the original question with = signs. Substitute the solution inn the question: it should make it true. 2) (Back to the inequalities) Pick another number that satisfies the solution inequality - e.g. if x>2, pick 5. Substitute this into the original inequality: if it makes it true, then you are good to go!
What are the steps to solve a whole number equaiton?
To solve a whole number equation, follow these steps: Simplify both sides of the equation by combining like terms. Use inverse operations to isolate the variable on one side of the equation. Perform the necessary operations to solve for the variable. Check your solution by substituting the value back into the original equation to ensure it satisfies the equation.
How do you know when an equation has no solution?
when you're really good in that kind of equation, but cannot, no matter what u do, CANNOT figure it out! when you look it up and can't find the answer in the back of the book. It depends on what kind of problem it is.
How do we verify answers in maths?
To verify your answers in a math problem it is best to work backwards. For example if you were dividing 4 by 2 and you get the answer 2 you would check it by multiplying 2 time 2. If it is an algebraic equation you can simply substitute the answer back into the original equation. Example with the problem 2X + 1 = 5 and you get the answer X=2 you simply substitute 2 back into the original problem for X...... 2(2) + 1 = 5
How do you check to see if your solution is correct in an equation?
Plug your answer back into the original equation.Example:3x+15=21x=23(2)+15=21
X plus y equals 15 and 4x plus 3y equals 38?
rewrite first equation: x = 15 - y substitute into second equation for x: 4(15 - y) + 3y = 38 distribute and simplify: 60 - y = 38 solve: y = 22 plug back into first equation: x = -7 -OR- multiply first equation by -3: -3x - 3y = -45 add new equation to second equation: 1x + 0y = -7 or x = -7 plug back into first equation: y = 22
What does it mean to check your answer?
usually used when solving an equation or inequality. Checking one's answer is plugging the answer back in the beginning to make sure you got the correct solution.
How do you check a solution to a system of equations?
Put the values that you find (as the solution) back into one (or more) of the original equations and evaluate them. If they remain true then the solution checks out. If one equation does not contain all the variables involved in the system, you may have to repeat with another of the original equations.
