Question

An isosceles triangle in which angles B and C have the same measure is shown. Find the measure of each angle whose degree measure us represented with variables. Angle A: x+8y-1 Angle B: 3y+4 Angle C:7x+5

Answer 1

A: 100
B:40
C:40

Answer 2

7x+5=3y+4
7x-3y=-1
add all the angles...to get...
8x+11y+8=180
8x+11y=172
..........
(7x-3y=-1)*11
(8x+11y=172)*3
...........
77x-33y=-11
24x+33y=516
..........
101x=505
x=5
......
7(5)+5=40....Angle C...= Angle B
Which means Angle A= 100...