# Find the Equation Using Two Points (5,5) , (5,4) ,
Use to calculate the equation of the line, where represents the slope and represents the y-intercept.
To calculate the equation of the line, use the format.
Slope is equal to the change in over the change in , or rise over run.
The change in is equal to the difference in x-coordinates (also called run), and the change in is equal to the difference in y-coordinates (also called rise).
Substitute in the values of and into the equation to find the slope.
Finding the slope .
Multiply by .
Subtract from .
The expression contains a division by The expression is undefined.
Undefined
Since the slope is , this is a vertical line. Since a vertical line has a constant value of and the line must pass through , the equation is .
Find the Equation Using Two Points (5,5) , (5,4)

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