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Determine x if the points (1,5), (2,x)and( -2,-1)are colliniar​

Answer»

x = 7Step-by-step explanation:given that A(1,5)    B(2,x)   C( -2,-1) are collinear,slope of AC = slope of BCslope = (Y2 - y1) / (x2 - x1)slope of AC = -1 -5 / -2 -1                    = -6/-3 = 2slope of BC = -1 -x / -2 - 2                   = x + 1 / 42 = x +1 /4 8 = x + 1x = 7



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