Three triangles are shown. x represents the measure of an angle, y represents the measure of its supplement, and a and b represent the measures of the other 2 angles. Which of the following statements is true for all three triangles?

x>y because a+b>y
x is greater than y because A plus b is greater than y

y>x because 180−x>a+b
y is greater than x because 180 minus x is greater than A plus b

x=(a+b)−180
x is equal to open paren A plus b close paren minus 180

y=180−(a+b)