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

 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