Pre-Algebra Examples

$100 - 80 x + 30$

Step 1

Write $100 - 80 x + 30$ as an equation.

$y = 100 - 80 x + 30$

Step 2

Add $100$ and $30$ .

$y = - 80 x + 130$

Step 3

The given equation $y = - 80 x + 130$ can not be written as $y = k x^{2}$ , so $y$ doesn't vary directly with $x^{2}$ .

$y$ doesn't vary directly with $x$