Question

Someone help please I don’t understand how to do this. I need the y intercept x intercept and f(15) and f(?)=12.44

Answer 1

In order to find the y-intercept you have to plug in 0 for x in the equation, so:

f(0) = -1.4(0) - 15

When you solve, you would get y-intercept = -15

In order to find the x-intercept you have to set the equation equal to 0, so:

0 = -1.4x - 15

Solve for x and you would get -10.714...

f(15) = -1.4(15) - 15

f(15) = -36

-1.4x - 15 = 12.44

Add 15 to both sides

-1.4x = 27.44

Divide both sides by -1.4

x = -19.6