How can you tell if the rule you have written for a set of points is correct?

Hey there!

In order to do that, you take both of the x values and plug them back in to see if you got the desired y value. If you do, it's correct.

For example:

If you had the equation:

y = 2x + 5

and had the points (5,15) and (3,1)

We would check the first coordinates by plugging in the x value:

y = 2(5) + 5
y = 15

Since 15 is our y value, we're correct.

For our next, we can do the same thing, and plug in the x value:

y = 2(3) + 5
y = 6 + 5
y = 11

Since we don't have our desired value, we know we're wrong.

Hope this helps!

Letter a i would say