exam Maths Puzzle Numerical Ability

Can someone help me on this problem? I put it through last night but I typed it in wrong.
Which of the ordered pairs (-3, 3), (9,0), (-3, -3), (-23, 8)

are solutions for the equation x + 4y = 9?

Thanks,
Sher

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exam Other Question
The area of a rectangle is 24 square meters.Find the length and width of the rectangle if its length is 2 meters greater than its width. Use an equation and the formula---->area of the rectangle=(width)(length). let f(x)=sqrt x+1 and g(x)=1/x+1 and evaluate

(f*g) (x)