How to find missing number.,(180,14) (120,8) (?,4) (220,18)

Answer 1

If we assume that the ordered pairs (x,y)
follow a linear rule y=ax+b, we will be able to solve for the rule using two of the ordered pairs, and use the third to check if the rule is appropriate.

Thus, for the first ordered pair:
y=ax+b => 14=180a+b .... (1)
For the second ordered pair,
8=120x+b .... (2)
subtract (2) from (1):
6=60a => a=1/10
Substitute a into (1):
14=180(1/10)+b => b=-4
So the linear function is
y=x/10-4

Check with the fourth ordered pair:
220(1/10)-4=22-4=18 so it works.

Thus now put a and b into the third ordered pair and solve for x:
4=x(1/10)-4
Solve for x.

Answer 2

I want the correct answer

Answer 3

The numbers in the circles go together in a certain way
Find the missing number marked by the question mark: 180, 14 120, 8 ___? 4 220, 18