Question

How do you find the value of x?

Answer 1

since it is an equilateral triangle (all angles are 60 degrees), all the sides are the same size

Answer 2

so 4=2x-3
solve for x

Answer 3

Find the degree of the unknown angle by subtracting from 180

Since all angles are the same, the side lengths must be equal (AB = BC = CA).
\[4 = 2x-3 = 2y+6 \]
Solving for x gives you
\[x= \frac {7}{2}\ \]
and if you wanted to find out the value of y, you can also find that:
\[y= -1 \]