Y=-2 should be the answer
Answer:

Step-by-step explanation:
Remove the parentheses and take out the constansts.

Simplify 7 x 3 to 21.

Use the product rule: 

Simplify 2+5 to 7.

Simplfiy 3 + 8 to 11.

Answer:
m = 
Step-by-step explanation:
Given
=
( cross- multiply )
6m = 21 ( divide both sides by 6 )
m =
=
( = 3.5 in decimal form )
Complementary angles mean the angles add up to 80 and Supplementary angles mean the angles add up to 180. So 120 doesn't have those kinds of angle pairs. The only combo i can think of is 40,40,40.