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# maths-watch grade 7 question

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y is inversely proportional to the square of x.

A table of values for x and y is shown.

 X 1 2 3 4 Y 4 1 4/9 1/4

a, Express y in terms of x.

b, work out the posative value of x when y = 25

Apr 4, 2020

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a. $$y=\frac{4}{x^2}$$

b.$$25=\frac{4}{x^2}$$ Multiply x^2 on both sides. Use calculator to find that x=positive or negative 2/5

Apr 4, 2020