Answer:
The answer of your question is: x = 5
Explanation:
It's and isosceles triangle then ∠ A = ∠C
73 = 8y - 7
8y = 73 + 7
8y = 80
y = 80 / 8
y = 10
∠ C = 8(10) -7
∠ C = 73°
The sum of the internal angles in a triangle equals 180°
∠A + ∠B + ∠C = 180°
73° + (6x + 4) + 73° = 180° Substitution
6x + 4 = 180 - 73 - 73
6x =34 - 4
6x = 30
x = 30 / 6
x = 5