Can someone help me with this

Hi my sisters and brothers can tell me the answer because i don’t understand the question

The measure of angle 0 is 600 degrees

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.