exam Maths Puzzle Numerical Ability

the question is:

(Fraction form)

21a(squared)b/7a(squared)b + [a(squared)/b(squared)]0=

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exam Other Question

A. 5x + 6y =18 for y
When graphed this equation would be a line. By examining your answer to part a, what is the slope and y-intercept of this line? Using coordinate geometry,prove that the segments joining the midpoints of adjacent sides of W(0,0), X(2b,2c), Y(2a+2b<2c) and Z(2a,0) form a parallelogram. I don't know if this he