Question

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

Answer 1

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