SOLUTION: They want me to graph 2x-5y=-20 I simplified it to y=mx+b and got y=-2/5x+4 I am not sure if that is right can you tell me if that is right and tell me how it would look graphed th

Algebra ->  Average -> SOLUTION: They want me to graph 2x-5y=-20 I simplified it to y=mx+b and got y=-2/5x+4 I am not sure if that is right can you tell me if that is right and tell me how it would look graphed th      Log On


   

Question 890376: They want me to graph 2x-5y=-20 I simplified it to y=mx+b and got y=-2/5x+4 I am not sure if that is right can you tell me if that is right and tell me how it would look graphed thanks
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
It should be y+=+%282%2F5%29x+%2B+4. Notice it's positive 2/5 and not negative 2/5.

Looking at y=%282%2F5%29x%2B4 we can see that the equation is in slope-intercept form y=mx%2Bb where the slope is m=2%2F5 and the y-intercept is b=4


Since b=4 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 2%2F5, this means:

rise%2Frun=2%2F5


which shows us that the rise is 2 and the run is 5. This means that to go from point to point, we can go up 2 and over 5



So starting at , go up 2 units


and to the right 5 units to get to the next point



Now draw a line through these points to graph y=%282%2F5%29x%2B4

So this is the graph of y=%282%2F5%29x%2B4 through the points and