Solve this system of equations using the Substitution method. Don't forget to write your final answer as a coordinate point. You must show all your work 3x + y = -2
y = 2x +3

this doesn't make sense lol

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

step-by-step explanation: 2