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To find a line that goes through two given points first find the slope between the points. (y-y)over (x-x) Then use a formula to find the rest.
I use the slope intercept formula and find "b" the y-intercept.
Let's try one.
(2,7) and (3,10)
7-10=-3
2-3=-1
-3/-1=3 the slope
7=3(2)+b
7=6+b
7-6=b
1=b
SO y=3x+1 is the formula for a line going through (2,7) and (3,10)
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By substitution
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Subtract the equation of one line from the equation of the other
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