X - (-2) = 21 <== ur equation
x + 2 = 21
x = 21 - 2
x = 19
Answer:
1
Step-by-step explanation:
The slope of the line is 1. To find slope use the formula 
, this calculates the change in y over the change in x. So plug in the known values 
, this equals 3/3 or 1. This means every time y increases by 1, x will also increase by 1.
So make and angle with the measure of 45 degrees. And then label it DOG. It doesn't matter where you start labeling as long as O is your midpoint. :)
Each side is about 290mm long
