Answer:
supplementary
Step-by-step explanation:
Angles 2 and 3 form a straight line. Straight lines are supplementary
Supplementary
1 and 2 are vertical along with 3 and 4 they can't be complementary non of them form right angles but supplementary is a straight line making 180 degrees.
x ÷ a - b = c
x a-b both side
x = c(a-b)
or
x = ca - bc