exam Maths Puzzle Numerical Ability

I recently sent you a substitution problem , but it actually a addition method problem.Sorry. The problem was:

x-4y=5
x-2y=1

My answer was -3, -2. Is that correct?

Thankyou

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exam Other Question

Coffee powder costing $12.75 per kg is mixed with coffee powder costing $8.95 per kg in the ratio 5:7 by weight. The mixture sold at $12 per kg. Find the gain percent. Express the following rational expressions in lowest terms y^5-3y^3+8y^2 over 5y