If x varies directly as square root of y and x = 81 when y = 9, Find x when y = 179

Assessment: JAMB UTME - Mathematics - 2011 Subject: General Mathematics

Question 1 Report

If x varies directly as square root of y and x = 81 when y = 9, Find x when y = 1 $\frac{7}{9}$

20

\frac{1}{4}

27

2

\frac{1}{4}

36

Answer Details

x $α \sqrt{y}$
x = k $\sqrt{y}$
81 = k $\sqrt{9}$
k = $\frac{81}{3}$
= 27
therefore, x = 27 $\sqrt{y}$
y = 1 $\frac{7}{9}$ = $\frac{16}{9}$
x = 27 x $\sqrt{\frac{16}{9}}$
= 27 x $\frac{4}{3}$
dividing 27 by 3
= 9 x 4
= 36

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