# Algebra Examples

Find the Start Point Given Mid (1,4) and End (7,-4)
,
The midpoint formula is .
Set the equal to the coordinate.
Solve for to get .
Substitute the values for and in to get .
Simplify the right side of .
Simplify each term.
Multiply by to get .
Multiply by to get .
Subtract from to get .
Set the equal to the coordinate.
Solve for to get .
Substitute the values for and in to get .
Simplify the right side of .
Simplify each term.
Multiply by to get .
Multiply by to get .
The start point is .

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