Question

Which value of x makes the open sentence true?

7 - x = 3x + 5


a. x = 3

b. x = 0.5

c. x = 2

d. x = 1.5

Answer 1

x=1/2 or 0.5

B. 0.5

Explanation:

Step one: Add x to both sides

you then get the equation 7=4x+5

Step two: subtract 5 from both sides

you then get the equation 2=4x

Divide both sides by 4 to undo the multiplication.

2/4=4x/4x

you get x=2/4 which simplifies to 1/2.