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Given two points; A(x₁,y₁) and B(x₂,y₂) the slope "m" is: m=(y₂-y₂)/(x₂-x₁) or m=(y₁-y₂)/(x₁-x₂) In this case: A(4,-7) B(4,8) m=(-7-8) / (4-4)=-15/0 because we have "0" in the denominator the line is vertical, and its slope is indefinitely.
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