exam Maths Puzzle Numerical Ability

hi! i have an assignment, due tomorrow but i still havent finished two problems. it says:
for each of the following transformations represent using a mapping (x,y)--->>(1/cx + h,

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exam Other Question

please help me solve this is what I got 5x-3y=13
4x-3y=11 My answer is x=3 and y =1 I do not think this is correct. please help.
factor:
4x(squared)-49y(squared)

factor:
4x(squared)-28x+49

simplify the rational expression
1
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1 + 1
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r x