The question is in the attached picture.

How to solve this is by plugging in each x and y into the equation. f(x) means the exact same thing as y. If the answer equals each other then the point is on the line

Part A:

x = 3

y or f(x) = -4

-4 = -3() + 6(3) + 5

-4 = -3(9) + 18 + 5

-4 = -27 + 18 + 5

-4 = -9 + 5

-4 = -4 ------------------------------------------------->This point (3, - 4) is on the line

Part B:

x = -1

y or f(x) = 4

4 = -3() + 6(-1) + 5

4 = -3(1) - 6 + 5

4 = -3 - 6 + 5

4 = -9 + 5

4 = -4 ------------------------------------------------->The point (-1, 4) is NOT on the line

You can use a graph to check it, which I provided below.

Hope this helped!

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )