Question

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

Answer 1

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

$y=3x+7$

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