I need to find the value of x. Im only given the a degree how would you solve this?

The triangle is isosceles so the other two angles are the same.

Since all the angles in a triangle add up to $180^circ$ then those angles are $70^circ$ each. Now, $x$ is the suplementary angle to one of them i.e. $70^circ + x = 180^circ$ therefore $x = 110^circ$