Test Index

JAMB Mathematics 2015 Paper

Question : 13

Total: 61

Solution:

Concept:

A line that passes through the origin has the form

y = mx

So only the slope

m

is needed.

Explanation:

The line passes through the origin

(0, 0)

and the point

(-3, -4)

Calculate the slope

m

using these two points:

m = \frac{-4 - 0}{-3 - 0} = \frac{-4}{-3} = \frac{4}{3}

Since the line passes through the origin, the intercept

b = 0

Therefore, the equation is:

y = \frac{4}{3}x

Answer:

The correct option is B:

y = \frac{4x}{3}

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