What is the value of y in the solution set of the system of linear equations shown below?
y = −x + 12
4x − 2y = 36
a 10
b 8
c 6
d 2

Find the value of the cosine for angle a

If anyone has done the algebra 2 chaos theory portfolio would you be wiling to me? i kind of know what i'm doing i just don't know if i'm doing it right.

What is the point slope form of a line with slope -5 that contains point (2,-1)