Solving system of equation by substitute

1. -4x + y = 6
-5x - y = 21

2. -5x + y = -2
-3x + 6y = -12

addition

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

answer: c. is your answer

step-by-step explanation: get me a black leather coat

a.)the line for function b is steeper