You’re going it plug in the inputs for every input for the letter x. So the first one, fx= -4(-2)+1= 9. The second one fx= -4(0)+1=1. The third one fx= -4(5)+1=19.
The answer is (-2,-10) you just need to plug them in.
Answer:
The sides of the triangle are proportional so the length of GE=18 cm
