The output of a function is 7 more than 3 times the input find the input when the output is -8

Question

asked Dec 6, 2020 73.0k views

1 Answer

Tarreq · Answer 1 · 2020-12-10T21:35:50+0000

Answer:

The input is -5 when the output is -8

Explanation:

Let

y-----> the output

x ----> the input

we know that

The linear equation that represent this problem is

y=3x+7

so

For y=-8

substitute in the equation and solve for x

-8=3x+7

Subtract 7 both sides

$-8-7=3x\\-15=3x$

Divide by 3 both sides

x=-5

therefore

The input is -5 when the output is -8