Greetings!
Answer:
x = 5
Explanation:
Because this is an isosceles triangle, as indicated with the parallel lines on lines AB and BC, angles A and C are the same, because both lengths are the same.
This can mean that angle B can be discovered by adding the two angle sizes together:
73 + 73 = 146
To find the angle of B, you can subtract the above value from 180 (total angle size in a triangle:
180 - 146 = 34
So angle B = 34
This also means that:
6x + 4 = 34
Isolate the 6x by moving the +4 over to the other side, making it a negative:
6x = 34 - 4
6x = 30
Simply divide both by 6 to find x:
x = 5
So the value of x = 5!
Hope this helps!