Write an equation of a line, in slopeintercept form, which passes through points (4,6) and (6,12) (4,6) , (6,12) y2  y1  = slope x2  x1 12  6  {substituted coordinates into slope formula} 6  4 6  {subtracted on top and bottom} 2 slope = 3 {divided 6 by 2} Pointslope formula is: y  y1 = m(x  x1) (4,6), m = 3 y  6 = 3(x  4) {substituted slope and first point into pointslope formula} y  6 = 3x  12 {used distributive property} y = 3x  6 {added 6 to both sides} © Algebra House
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