How do you solve #y=2/7x+2, 6x-21y=-42#?
There are infinite solutions.
The first equation already gives an expression for
Expand the left hand side:
This leads to an equation like
In general, a linear system is composed by the equations of two lines, and we're looking for the point of intersection. In cases like this, both equations represent the same line, so there are infinite points of intersection.