exam Maths Puzzle Numerical Ability

quadratic equations-word problem
Chris cuts half a rectangular lawn, 40m by 30m, by mowing strips around the perimeter. Jerri cuts the small rectangle left. How wide a strip does Chris cut so that they share the work equally?

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exam Other Question
I dont understand what im supposed to do for this problem:
without graphing, determine if the graphs of each pair of equations are parallel, perpendicular or neither.

2y=8x+4 and y=-1/4x Please help! Can you explain to me or show me how to do the following problem :

Draw and label :

Line L and M in plane ABC intersect at point C