Question

Two lines, A and B, are represented by the following equations:

Answer 1

There are equivalent equations just like there are equivalent fractions.

x + y = 4....multiply this entire equation by 3
3(x + y) = 3(4) = 3x + 3y = 12 ...this is the exact same line as the other equation.
This means ur lines are equivalent, they are the same line.
This means there is infinite solutions <==