exam Maths Puzzle Numerical Ability

Find the slope of the line 7x + 63y = 28.
Find the y-intercept of the equation

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exam Other Question

A takes twice as long as B & C together take to do a piece of work & B takes twice as long as A & C together . However , the 3 men together can complete the work in 30 days. How long will C alone do the whole work ? This one can solved by writing as it in long division. Most of mine had ben easy but this one a lot different then the others.

7x^2+x-8/x-1