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Question

# Let$Q \left( x ^ { \prime } , y ^ { \prime } \right)$be any point of L' different from$P \left( x _ { 1 } , y _ { 1 } \right)$Explain why$\frac { y ^ { \prime } - y _ { 1 } } { x ^ { \prime } - x _ { 1 } } = m$.

Solution

Verified

Since Q and P are both on line $L'$, and slince we know that $L'$ has slope m, the definition of slope yields the equation.

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