Question: Solve the following using the system of equations.
2x + y = 11 -------------------- (1)
2x + z = 15 -------------------- (2)
y + 3z = 24 -------------------- (3)
(1) - (2)
y - z = -4 ----------------------- (4)
y + 3z = 24 ------------------- (5)
(5) - (4)
4z = 28
z = 7
Using (4), y = 3
Using (1), x = 4
Solution: x = 4, y = 3, z = 7