Question

A function is shown below

y=-5x-7

If the input into the function is -4 what is the output?

Answer 1

`\\ \rm\longmapsto y=-5x-7`

`\\ \rm\longmapsto y(-4)`

`\\ \rm\longmapsto -5(-4)-7`

`\\ \rm\longmapsto 20-7`

`\\ \rm\longmapsto 13`

Answer 2

• 13

Explanation:

Put input value instead of the x into equation and calculate the output:

• y = -5x - 7

x = -4, then find the value of y:

• y = -5(-4) - 7 = 20 - 7 = 13

The output is 13 when the input is -4