exam Maths Puzzle Numerical Ability

OK I'm back with 2 questions here, I just had Surg. Monday so I'm really out of it but I tried to solve these none the less and I need some help please.

ymxm-y3xm
xxm2-y3xm
ym

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exam Other Question

D-16, Construction: Concrete weighs 150 lb/cu ft. What is the weight of a concrete wall 18 ft. long, 4 ft 6 in high, and 8 in. thick? Determine if the following lines are parallel, perpendicular or neither.

y-3x=5 3x+y=7