Question

The table below shows the relation betweeen time (x) and the number of pages printed (y).
Which of the following equation represents the data in the table?

• A. y = 4x
• B. y = 3x
• C. y = 2x
• D. y = 20x

Answer 1

The correct option is A y = 4x

The data in the table are in proportion.
The required equation for the proportional relation is y = mx.

Slope (m) = $\frac{\text{Change in y}}{\text{Change in x}}$

= $\frac{200-80}{50-20}$

= $\frac{120}{30}$

= 4

Hence, the required equation is y = 4x.