exam Maths Puzzle Numerical Ability

this equation is asking to factor completely
ax-ay+x^2-xy

please help,I am not sure quite how to do this.

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exam Other Question

Find the slope of the line whose equation is 8x+7y=56? Can you solve this;

Four times the measure of the complement of angle B is 12 more than twice the differance between the measures of its supplement and complement. Find the measures of angle B.