exam Maths Puzzle Numerical Ability

Please help.

Which of the ordered pairs (3, 1), (0,-4), (-4, 0), (-3 , -7)

are solutions for the equation x - y = 4.

Thanks
JMS

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exam Other Question

A rectangle has one side twice the length of the other. Express the area of the rectangle as a function of its perimeter. A(P). 1.Find the value of 20x when x=10?

2.find the value of 3a when a=-4?

3.find the value of 11(a+b) when a=7 and b=3?