l in the missing numbers to complete the linear equation that gives the rule for this table.
x y
0 67
1 49
2 31
3 13
y =
x +
note that y decreases by 18 at each step. so
y = -18x + b
now just plug in any of the (x,y) pairs to find b
a handy one is where x=0, and you get
y = -18x+67