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Equation - Solution to 130 - 2x = 2











































Algebra – Understanding what variables represent in equations

1. Define Equation.

2. What does the x stand for in the equation 130 - 2x = 2?

3. Which of the following numbers are solutions to the equation ?

24, 21, 45, 64


Comments for Equation - Solution to 130 - 2x = 2

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Jun 25, 2012
Solution to 130 - 2x = 2
by: Staff


The answer:

1. Define Equation.

An equation states the values of two expressions (expression 1 and expression 2) are equal.

It is normally written in the following notation:

expression 1 = expression 2

for example:

4 + 1 = 2 + 3

The expression 4 + 1 = 5, and the expression 2 + 3 also = 5

The expression 4 + 1 can be replaced with the expression 2 + 3, and vice versa. They are equivalent.



2. What does the x stand for in the equation 130 - 2x = 2?

The x is a placeholder which stands for a number (a number which is unknown).



3. Which of the following numbers are solutions to the equation ?

24, 21, 45, 64


To find the answer to this question, substitute each number for x to see which number makes the equal sign true.

Substitute 24 for x

130 - 2x = 2

130 - 2*24 =? 2

130 - 48 =? 2

82 ≠ 2, the variable x does not stand for the number 24


Substitute 21 for x

130 - 2x = 2

130 - 2*21 =? 2

130 - 42 =? 2

88 ≠ 2, the variable x does not stand for the number 21




Substitute 45 for x

130 - 2x = 2

130 - 2*45 =? 2

130 - 90 =? 2

40 ≠ 2, the variable x does not stand for the number 45


Substitute 45 for x

130 - 2x = 2

130 - 2*64 =? 2

130 - 128 =? 2

2 = 2, the variable x stands for the number 64


x = 64



Thanks for writing.

Staff
www.solving-math-problems.com



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