exam Maths Puzzle Numerical Ability

currently pete is three times older than his son the sum of their ages is 80 how old are each of them

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exam Other Question

My question is -x^2 (or negative x squared). If x=6, is the answer -36?
How about -3x^2 (or negative 3 x squared). If x=6, is the answer -108? Graph 3x+2y=6
2y=-3x+6
y=-3x/2+6/2
y=3x/2+3
How would this be graphed? Would it be graphed with the line running through (2,0) and (3,0)?