A 10-inch candle burns at a constant rate of 1 inch per hour.
Rule in words: To determine the height of the candle multiply the number of
hours that the candle burns by 1 inch per hour, and subtract the product from
the candle’s initial height (10 inches).
Rule in Equation: If y represents the height of the candle after x hours of
burning, then the relationship can be expressed as an equation in the form y
= mx + b, where m represents the rate at which the candle burns (1 inch per
hour) and b represents the initial height of the candle (10 inches).
Height of Candle = Rate at which it Burns • Number of Hours Burned +
Initial Height
y = -1 • x + 10, or y = 10 -1x
