The points (-1,r) and (2,1) lie on a line with slope -4 find the missing coordinate
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(6, 2 )
substitute x = 5 into the equation and solve for y
6y + 8 = 20 ( subtract 8 from both sides )
6y = 12 ( divide both sides by 6 )
y = = 2
the ordered pair is (5, 2 )