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WAEC Mathematics 2017 Paper

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Question : 7

Total: 49

If x =

\frac{2}{3}

and y = - 6, evaluate xy -

\frac{y}{x}

0
5
8
9

Solution:

Concept:

Substitute the given values of

x

and

y

into the expression and simplify using the correct order of operations.

Explanation:

Given

x = \frac{2}{3}

and

y = -6

.

Substitute into

xy - \frac{y}{x}

.

xy = \frac{2}{3} \times (-6) = -4

\frac{y}{x} = \frac{-6}{\frac{2}{3}} = -6 \times \frac{3}{2} = -9

Now evaluate the expression:

xy - \frac{y}{x} = -4 - (-9) = -4 + 9 = 5

Answer:

5

Option B.

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