Answer: first option.
Step-by-step explanation:
By definition, the measure of any interior angle of an equilateral triangle is 60 degrees.
Then, we can find the value of "y". This is:
[tex]2y+6=60\\\\y=\frac{54}{2}\\\\y=27[/tex]
Since the three sides of an equilateral triangle have the same length, we can find the value of "x". This is:
[tex]x+4=2x-3\\\\4+3=2x-x\\\\x=7[/tex]
