Answer:
x=30, y=90
Step-by-step explanation:
y+x and y-x are supplementary angles. They must add to 180 degrees
y+x+y-x = 180
Combine like terms
2y = 180
Divide by 2
2y/2 = 180/2
y= 90
y+x and 2x are supplementary angles. They must add to 180 degrees
y+x+2x = 180
y+3x =180
We know y =90
90+3x=180
Subtract 90 from each side
90-90 +3x = 180-90
3x= 90
Divide by 3
3x/3 = 90/3
x = 30
