Answer:
first option
Step-by-step explanation:
Using the rule of exponents
=
then
=
= 
Are these 3 separate questions?
Answer:
y=2
Step-by-step explanation:
3(y - 1) +2(y + 3) = 13
3y-3+2y+6=13
5y+3=13
5y=10
y=2
I'm assuming there is a typo in the question, and the expression is actually "6x+40". That expression factored is 2(3x+20).
M=undefined, because it is a vertical line. A horizontal line would be 0.
y-intercept=undefined
equation=x=a(x-intercept)