exam Maths Puzzle Numerical Ability

Solve the system by addition.
4x + 8y = -1
8x - 4y = -7

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exam Other Question

Im supposed to write each fraction as an equivalent fraction with the given denominator. Was doing good until they threw in letters. Can you help explain this process?

1/6 as ?/24x

Thanks x^3+5x^2+2x-8 find prime factors using the factor theorem