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JAMB Mathematics 2019 Paper

Question : 21

Total: 73

Solution:

Concept:

For a straight line, the standard equation is

y = mx + c

Here,

m

is the slope of the line and

c

is the

y

-intercept.

Explanation:

Use the two given points

A(3,12)

and

B(5,22)

to find the slope.

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

m = \frac{22 - 12}{5 - 3}

m = \frac{10}{2} = 5

The line is said to have an intercept at

2

, so

c = 2

Substitute the slope and intercept into

y = mx + c

y = 5x + 2

Answer:

Option A:

y = 5x + 2

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