Which ordered pair is the solution to this system of equations? {x+5y=−15
y=1/5x+1

A.) (−5, −2)
B.) (−10, −1)
C.) (−7, −0.4)
D.) (−8, −1.2)

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:

maybe i can

step-by-step explanation:

mean or average is 40.6