exam Maths Puzzle Numerical Ability

My assignment is to solve the system of equations: 3x + 4y+ z = 7, 2y + z = 3, -5x + 3y + 8z = -31

But it seems unsolveable to me. I see no way to eliminate any variables.
What am I missing?

Read Solution (Total 0)

exam Other Question

1. In this problem, we will analyze the profit found for sales of decorative tiles. A demand equation (sometimes called a demand curve) shows how much money people would pay for A line passing through (6, 9) and (5, y) is parallel to a line with slope 5. What is the value of y?