y-y*1=m(x-x*1)

Solution for y-y*1=m(x-x*1) equation:

Simplifying
y + -1y * 1 = m(x + -1x * 1)

Reorder the terms for easier multiplication:
y + -1 * 1y = m(x + -1x * 1)

Multiply -1 * 1
y + -1y = m(x + -1x * 1)

Combine like terms: y + -1y = 0
0 = m(x + -1x * 1)

Reorder the terms for easier multiplication:
0 = m(x + -1 * 1x)

Multiply -1 * 1
0 = m(x + -1x)

Combine like terms: x + -1x = 0
0 = m(0)

Reorder the terms for easier multiplication:
0 = 0m

Anything times zero is zero.
0 = 0m

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.