## Solve equations with two unknowns

Given two equations: (1) x + 5y = 12 (2)  3x + 2y = -3 1st Step: Solve equation (1) x=12-5y 2nd Step: substitute x into equation (2) and solve y 3(12-5y)+2y = -3 36-15y+2y = -3 (-13)y = -3-36 y = (-39)/(-13)  y = 3 3rd Step: substitute x into 1st step equation x = 12-(5times3) x = -3