exam Maths Puzzle Numerical Ability

9/4a=13

or 9 = 13 * 4a

or 9 = 52a

or 9 / 52 = a

2/7=x/3

or (2 /7) * 3 = x

or 6/7 = x

7x/8-1/4+3x/4=1/16+x

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exam Other Question

Find P(-1/2) if

P(x)=x^4+3x^2+2

(-1/2)x=x^4+3x^2+2? Is this right? and then I solve from there....How would I do this?
Help I cannot get this :)
Find values for m and b in the following system so that the solution to the system
is (3, 4).
5x+7y=b
mx+y=22