If you have a pair of coordinates you can find the slope then put it into either point slope or slope intercept form.
(2,3) and (5,4) has a slope of (3-2)/2-4) or 1/-2 or -1/2
Then you can put that in y-3=-1/2(x-2) as point slope
or y=-1/2(x) + b
3=-1/2(2) + b
4=b therefore y=-1/2x+4
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I am sorry but the question is incomplete. You have not mentioned the ordered pairs and the equation is incomplete as well.
There are infinitely many ordered pairs. One of these is (0, 0).
There are an infinite number of ordered pairs that satisfy the equation.
1,6 2,12 3,18 4,24 5,30
None. There is no equation or inequality in the question - only an expression. An expression cannot have a solution.