4x+7y=10
-4x-6y=28
To find the length of side HJ, we need to use sine, as we're looking for the length of the side that is opposite to the side where we have an angle measure.
Sin(70*) = x/13
Sin(70* = 0.94) = x/13
Multiply both sides by 13.
Sin = 12.21 = x
The side HJ is equal to 12.21.