Find x and y

Question

One angle is 4y the other one is (5x-10) and the other one is (3x+10)

Answer 1

if you have an isosceles triangle the two base angles are congruent

assuming that 5x-10 and 3x+10 are congruent

5x-10=3x+10

5x-3x=10+10

2x=20

x=10 (answer)

5x-10=5*10-10=50-10=40

3x+10=3*10+10=30+10=40

40+40=80

180-80=100

4y=100

y=100/4

y=25 (answer)