exam Maths Puzzle Numerical Ability

I have 7 - 3y = 9x and I have to find the slope
I got 21/7 is that right?

Thanks!

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exam Other Question

pg. 261
94) Swimming space. The length of a rectangular swimming pool is 2x - 1 meters, and the width is x + 2 meters. Write a polnomial that represents the area. Find the area if x is 5 meters.
answer: 2x^2+3x-2sq. m. 63 sq. m.
x-[3x-2(9-x)-x} < x-(5-x)