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WAEC Mathematics 2020 Paper

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Question : 39

Total: 48

x	6.20	6.85	7.50
y	3.90	5.20	6.50

The points on a linear graph are as shown in the table. Find the gradient (slope) of the line.

2 $\frac{1}{2}$
2
1
$\frac{1}{2}$

Solution:

Concept:

The gradient of a straight line through two points is the ratio of the change in

y

to the change in

x

.

Explanation:

Take two points from the table:

(6.20, 3.90)

and

(6.85, 5.20)

.

Gradient

= \frac{y_2 - y_1}{x_2 - x_1}

= \frac{5.20 - 3.90}{6.85 - 6.20}

= \frac{1.30}{0.65}

= 2

Answer:

Gradient

= 2

, which is option B.

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