Answer:
[tex]x = 10[/tex]
Step-by-step explanation:
To make A and B parallel, the two angle measures will have to be congruent, or equal. To show this, we can write an equation. Then, we can solve for x.
[tex]4x = 3x + 10[/tex]
Subtract 3x.
[tex]4x - 3x = 3x + 10 - 3x[/tex]
Simplify.
[tex]x = 10[/tex]
