Y=10x+8
8 is the y intercept because it’s when x=0
It would be 4d because there is a one in from the d that is by itself but you cannot see it and therefore 5d-1d= 4d.
Hope this helps! :)
Angle C is π - (π/4) - (π/3) = 5π/12. The Law of Sines tells you
... a/sin(A) = c/sin(C)
... a = sin(A)·c/sin(C)
... a = sin(π/4)·10/sin(5π/12) ≈ 7.32
The length of the side opposite angle A is about 7.32.