Find y if the point (-6,y) is on the line that passes through (-1,7) and (3,-12).
Slope = ( -12 - 7) /( 3 - - 1) = -19/ 4
So using the slope and (3, -12)
y = (-19/4) ( -6 - 3) - 12
y = ( 171) / 4 - 12
y = (171)/4 - 48/4
y = 123/4
