I think the answer would be x=-7
y= 4x-1
y= 3x+6
y= 1x-1+6
y= 1x-7
x=-7
Since the triangle is isosceles we know that angle a is equal to angle c.
8y-7=73
8y=80
y=10
We also know that the sum of the interior angles in any triangle is 180 degrees.
73+73+6x+4=180
150+6x=180
6x=30
x=5
Need to just answer questions but try a maybe
Needs more info about your question please
