Find the measure of ∠c if

∠a = 52x + 30
∠b = 72x + 40
∠c = 92x + 10
∠d = 52x + 20

a)70°
b)80°
c)90°
d)100°

sup

step-by-step explanation:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.