Since all of the side lengths are different, it is a scalene triangle
Answer:
C, assuming you left off the y on the 30
Step-by-step explanation:
30(.5x-2)+40(.75y-4)
Distribute
15x-60+30y-160
Simplify
15x+30y-220
[4 over x equals 5 over 10]
Solve for x, so you need to isolate/get x by itself in the equation.
Multiply x on both sides

Multiply the inverse of 5/10, which is 10/5, to get rid of the fraction and get x by itself


8 = x