Answer:
x = 8, y = 79
Explanation:
y = 3x + 55 → (1)
y = 8x + 15 → (2)
substitute y = 8x + 15 into (1)
8x + 15 = 3x + 55 ( subtract 3x from both sides )
5x + 15 = 55 ( subtract 15 from both sides )
5x = 40 ( divide both sides by 5 )
x = 8
substitute x = 8 into either of the 2 equations and evaluate for y
substituting into (2)
y = 8(8) + 15 = 64 + 15 = 79