Question

I'm lost, please help :(

Answer 1

The rate of change would be 1.49 for every increase in x.

You can tell this because as the numbers go up by 1 in the x column, the f(x) values are going up by 1.49. And easy way to find this is to subtract the first amount from the second. You can double check with the second and the third.

2.98 - 1.49 = 1.49

4.47 - 2.98 = 1.49

Answer 2

The rate of change is y=kx where k is change. x represents the independent variable and y represents the dependent variable.

In this case, the cost is the dependent variable because it depends on how many pounds you want to buy. Plug in one of the pairs for x and y.

1.49=k*1
1.49=k

Final answer: The rate of change is 1.49. This means that for every extra pound you buy, you pay $1.49.