Question

A plant is 5cm tall and growing at a rate of 3cm a month. What equation is right?

1. y=5x+3
2. y=5-3x
3. y=3x+5

Answer 1

y=3x+5

Explanation:

The plant starts at 5cm so +5 is the starting height, It grows at 3cm a month making 3x the growth rate. so 3x+5 is the height of the plant every month.

Answer 2

It would be y=3x+5. This is because if it is going at a rate of 3cm a month, this makes it the constant value or the slope. But since it’s starting value is 5cm, that would make it the y-intercept, which is why your answer would be y=3x+5.