SOLUTION: How do I find the answer and graphing points for Y in the following equation 3x+3y=12

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This is a line. With lines you only need to plot two points and connect them unless you're asked for more.
If x=0
3(0)+3y=12
0+3y=12
3y=12
3y/3=12/3
y=4
Plot the point (0,4).
If y=0
3x+3(0)=12
3x+0=12
3x=12
3x/3=12/3
x=4
Plot the point (4,0).
Connect the dots and you'll get something that looks like this: