Answer:
The input is -5 when the output is -8
Step-by-step explanation:
Let
y-----> the output
x ----> the input
we know that
The linear equation that represent this problem is
[tex]y=3x+7[/tex]
so
For y=-8
substitute in the equation and solve for x
[tex]-8=3x+7[/tex]
Subtract 7 both sides
[tex]-8-7=3x\\-15=3x[/tex]
Divide by 3 both sides
[tex]x=-5[/tex]
therefore
The input is -5 when the output is -8
