A.) 4 B.) 5 C.) 6 D.) 7 E.) 8 y2  y1  = slope of a line x2  x1 The points have coordinates of (x1 , y1) and (x2 , y2) 7  1 3  =  {substituted given values into slope formula} k  1 2 6 3  =  {subtracted 7  1 in first fraction} k  1 2 3(k  1) = 6(2) {crossmultiplied to solve the proportion} 3k  3 = 12 {used distributive property on left} 3k = 15 {added 3 to both sides} k = 5 {divided both sides by 3} B.) 5  Algebra House
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