SOLUTION: Graph 3x+2y=12

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Question 127329: Graph

3x+2y=12
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

3x%2B2y=12 Start with the given equation


2y=12-3x Subtract 3+x from both sides


2y=-3x%2B12 Rearrange the equation


y=%28-3x%2B12%29%2F%282%29 Divide both sides by 2


y=%28-3%2F2%29x%2B%2812%29%2F%282%29 Break up the fraction


y=%28-3%2F2%29x%2B6 Reduce



So the equation is now in slope-intercept form (y=mx%2Bb) where the slope is m=-3%2F2 and the y-intercept is b=6




Looking at y=-%283%2F2%29x%2B6 we can see that the equation is in slope-intercept form y=mx%2Bb where the slope is m=-3%2F2 and the y-intercept is b=6


Since b=6 this tells us that the y-intercept is .Remember the y-intercept is the point where the graph intersects with the y-axis

So we have one point




Now since the slope is comprised of the "rise" over the "run" this means
slope=rise%2Frun

Also, because the slope is -3%2F2, this means:

rise%2Frun=-3%2F2


which shows us that the rise is -3 and the run is 2. This means that to go from point to point, we can go down 3 and over 2



So starting at , go down 3 units


and to the right 2 units to get to the next point



Now draw a line through these points to graph y=-%283%2F2%29x%2B6

So this is the graph of y=-%283%2F2%29x%2B6 through the points and