Replace x and y of the equation with the x- and y-coordinates, respectively, of each pair in the choices. If the equation becomes a true statement, then that ordered pair is on the line.
A. (4, 2)
y − 0.75 = 1.25(x − 3)
2 - 0.75 = 1.25(4 - 3)
1.25 = 1.25(1)
1.25 = 1.25
Since 1.25 = 1.25 is a true statement, the ordered pair (4, 2) is on the line.
B. (1, 1.75)
y − 0.75 = 1.25(x − 3)
1.75 - 0.75 = 1.25(1 - 3)
1 = 1.25(-2)
1 = -2.5
Since 1 = -2.5 is a false statement, the ordered pair (1, 1.75) is not on the line.
Now try the same process for options C and D.
