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**Nightfire** In class today, my teacher was going over a shortcut you can take in slope-intercept form working. Unfortuneately, i was half-dozing throughout the class, because i spent so much time yesterday working on social studies and language projects, and i had 2 hours of volunteer working, that i only got about 4 hours of sleep. Due to this, I have no clue how to do the shortcut. does anyone know of this shortcut, and how to work it?

here's a couple problems from each category we're supposed to do...

"Write the equation in slope-intercept form." (Note, we do not have to graph them.)

4x+5y=15

4x-y-3=0

x-y=0

"Decide whether the graphs of the two equations are parallel lines. Explain your answer."

y=-3x+2; y+3x=-4

2x-12=y; y=10+2x

y+6x-8=0; 2y=12x-4

thanks in advance. and dont worry, no more projects for a while, so i should be able to catch up on sleep...