Question

A candle stick burns at the rate of 0.2 inches per hour . After eight straight hours of burning the candle stick is 13.4 inches tall . (Please write it out) (y=mx+b)

Answer 1

Answer:  The required equation representing the given situation is $y=-14.8x+15.$

Step-by-step explanation:  Given that a candle stick burns at the rate of 0.2 inches per hour . After eight straight hours of burning the candle stick is 13.4 inches tall

We are to write the linear equation in slope-intercept form y = mx + c.

Let us consider that number of hours as x co-ordinates and corresponding length of the candle burnt as y co-ordinates.

Since after 8 hours, the candle is 13.4 inches tall, so in 0 hours, the height of the candle was

$13.4+8\times0.2=13.4+1.6=15.$

So, the linear function will pass through two points (1, 0.2) and (0, 15).

We know that

the slope of a line passing through the points (a, b) and (c, d) is given by

$m=\dfrac{d-b}{c-a}.$

So, the slope of the given linear function will be

$m=\dfrac{15-0.2}{0-1}=\dfrac{14.8}{-1}=-14.8.$

Since the function passes through the point (0, 15), so its equation will be

$y-15=m(x-0)\\\\\Rightarrow y-15=-14.8x\\\\\Rightarrow y=-14.8x+15.$

Thus, the required linear equation representing the given situation is $y=-14.8x+15.$

Answer 2

Does this help any? It's what I got.