# Functions: find equation that explains listed points

#### cmatthes12

##### New member
X Y
-2 5
-1 10
0 15
1 20
2 25

Write an equation that explains the relationship between the average X and average Y.
_____________________________
I'm trying to help my brother with this problem but I just can't figure it out.
-Thanks!

#### Loren

##### Senior Member
Re: Functions of an equation

I'm assuming that the word "average" was not in the original problem. Did you introduce that word? Do you see that for every unit that x increases, y increases by 5 units? Does that tell you anything about the slope?

#### Subhotosh Khan

##### Super Moderator
Staff member
Re: Functions of an equation

cmatthes12 said:
X Y
-2 5
-1 10
0 15
1 20
2 25

Write an equation that explains the relationship between the average X and average Y.
_____________________________
I'm trying to help my brother with this problem but I just can't figure it out.
-Thanks!
First thing to do in these types of problems is to - plot it. Then get an idea about what the equation "should" be.