exam Maths Puzzle Numerical Ability

Find the slope of the line whose equation is 8x+7y=56?

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exam Other Question

Your local bank offers free free checking for accounts with a balance of at least $500. Suppose you have a balance of $516.46 and you write a check for $31.96. How much must you de this equation is asking to factor completely
ax-ay+x^2-xy

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