book Maths Puzzle Numerical Ability

Here's the question that I have:Mary ha 200 knitted quares. Sue has 5000 knitted squares. Mary makes 20 knitted squares per hour. sue makes 15 knitted squares per hour. Mary an

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can you please help me to graph because im confuse to how to do it..
graph:(y-2)=-3/2(x=6)
3x + 7y = 1
x + 2y = 1

A) solution = (4,9) B) solution = (5,-2)
C) solution = (1,1/2) D) solution = (1/3 , 1/7)</PRE>