Question

shirts sold
amount raised (dollars)
1 4
2 8
3 12
4 16
amount raised = 4 · number of shirts
write the equation using $x$ for the number of shirts sold and $y$ for the amount raised.

Explanation:

Step1: Assign variables to given quantities

Let $x$ = number of shirts sold, $y$ = amount raised (dollars)

Step2: Translate rule to equation

The rule states $\text{amount raised} = 4 \cdot \text{number of shirts}$, so substitute variables.
$y = 4 \cdot x$ or $y = 4x$

Answer:

$y = 4x$