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WAEC Mathematics 2014 Paper

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Question : 45

Total: 49

The graph given is for the relation y = 2x² + x - 1.What are the coordinates of the point S?

(1, 0.2)
(1, 0.4)
(1, 2.0)
(1, 40)

Solution:

Concept:

Use the given quadratic equation to find the

y

-coordinate at the point where

x = 1

.

Explanation:

From the graph, point

S

lies on the vertical line

x = 1

.

Substitute

x = 1

into

y = 2x^{2} + x - 1

:

y = 2(1)^{2} + 1 - 1

y = 2(1) + 1 - 1

y = 2 + 1 - 1 = 2

Therefore, the coordinates of point

S

are

(1, 2.0)

.

Answer:

Option C:

(1, 2.0)

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