Substitute y = -4x + 15 to the equation y = 4x - 41:
-4x + 15 = 4x - 41 subtract 15 from both sides
-4x = 4x - 56 subtract 4x from both sides
-8x = -56 divide both sides by (-8)
x = 7
Put the value of x to the first equation:
y = -4(7) + 15
y = -28 + 15
y = -13
Answer: x = 7 and y = -13 → (7, -13)
