Question

The equations 2x+7=3 and bx-10=-2 have the same solution for x. Find the value of b.

Answer 1

Solve both equations for x:

2x+7 = 3

2x = -4

x = -2

Plug x into the equation which contains b:

b(-2) -10 = -2

-2b = 8

b = -4

Answer:

b = -4

x = -2