8x = 2y + 5 3x = y + 7 Use the substitution property We need to solve 3x = y + 7 for y 3x = y + 7 3x - y = 7 -y = 7 - 3x Divide both sides by -1 -y/-1 = -3x -7/-1 y = 3x - 7 Substitute 3x - 7 for y in 8x = 2y + 5 8x = 2y + 5 8x = 2(3x - 7) + 5 8x = 6x - 14 + 5 8x = 6x - 9 8x - 6x = -9 2x = -9 x= -9/2 To find y, we need to substitute -9/2 for x in y = 3x -7 y = 3x - 7 y = 3(-9/2) - 7 y = -41/2
