Developing a Formula: Setting Up and Solving an Equation in Two Unknowns (VCE SSCE General Mathematics): Flashcards

Setting up and solving linear equations in 2 variables

What varies in the problem

Build expression for first variable (cost × variable)

Combine expressions together

Substitute specific values and evaluate

$C = ax + by$ where $a$, $b$ are unit costs

Replacing variables with actual numbers

If $x = 0$ and $y = 0$, cost should be zero

Two decimal places (dollars and cents)

$ax$ dollars