Question

Write a linear equation representing the relation between number of burgers sold (y) and the price of burgers (x).

• A. y = 2x
• B. y = 3x
• C. y = 4x
• D. y = 15x

Answer 1

The correct option is C y = 4x

From the table,
$\frac{\text{y}}{\text{x}}\text{is}\frac{60}{15}=4\text{and}\frac{120}{30}=4$

Hence, 'Price' and 'Number of burgers' are proportional to each other.

The required equation for the proportional relation is y = mx

$\text{Slope (m)}=$ $\frac{Rise}{Run}$

= $\frac{120-60}{30-15}$

= $\frac{60}{15}$

= 4

Hence, the required equation is y = 4x.