y - 4x = -3
y = 4x - 3.....slope is 4, y int is -3
12x - 3y = 9.....divide everything by 3
4x - y = 3
4x - 3 = y...re-arrange
y = 4x - 3....slope is 4, y int is -3
u have the same line, meaning coincident lines.....infinite solutions
answer : coincident lines