Question

A system contains two equations: f(x) = 3x + 7 and g(x) = x – 9.

What is the x-value of the solution?
A.-1
B.-17
C.-8
D.4

Answer 1

There is something missing.

so from your options i will fill the missing condition: f(x) =g(x). find x.

If so,

3x + 7 = x -9

3x - x = -9 - 7

2x = -16

x = -8

option C

Answer 2

Firstly you would make the y values equal therefore: 3x+7=x-9 simplified x=-8