An isosceles triangle has base angles that each measure 42' Which equation can be used to find the measure
of the third angle of this isosceles triangle in degrees?

80%

step-by-step explanation:

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.