book Maths Puzzle Numerical Ability

Hi Tutors:
I am so lost over this one. Please help me:

Find the intersection point (if there is one) and graph shading the appropriate areas:
x+y >=0 and 2x+y<=4

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book Other Question

The directions on my paper read: Subtract the sum of the last two polynomials from the sum of the first two. Please help me.

1.) 2x^2-14xy+7y^2
2.) 3x^2-2 A clown weighs 60lbs. more than a trapeze artist. The trapeze artist weighs two thirds as much as the clown. How much does each weigh?

you have to make an eqation using this data.