Pre-Algebra Examples

$y = - \frac{5}{4} x^{2}$

Step 1

Simplify $- \frac{5}{4} x^{2}$ .

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Step 1.1

Combine $x^{2}$ and $\frac{5}{4}$ .

$y = - \frac{x^{2} \cdot 5}{4}$

Step 1.2

Move $5$ to the left of $x^{2}$ .

$y = - \frac{5 x^{2}}{4}$

Step 2

Since the equation can be written in the form $y = k x^{2}$ , $y$ varies directly with $x^{2}$ and $k$ . The constant of variation, $k$ , is $- \frac{5}{4}$ .

$- \frac{5}{4}$