3.50 26.00 × 5= - 8.50= <---- when you subtract 17.50 17.50. the total and how much is left over you get $17.50 $17.50 equals how much was spent when buying the pens
We call the ratio between two directly proportional quantities the constant of proportionality. When these two quantities may increase or decrease, the constant proportionality always remains the same
