exam Maths Puzzle Numerical Ability

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

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exam Other Question

Given r(x)=7x-22and t(x)=x^2+3,express the sum (r+t)(x). 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?