on a graph plot y=mx+b: m>0,b0,b>0

on a graph plot y=mx+b: m>0,b0,b>0

Answers
Make x=0 and you will obtain the corresponding y=b. So we have the first point let's call it A of coordinates 0 and b. A(0;b). Then we make y=0 and we get the corresponding value for x = - b/m, so we have the second point to plot, B(-b/m;0). When you plot A on axis you will notice that b is positive and that means that it will be situated on the above the origin on the y axis. When you plot B you notice that because m and b are positive, the number -b/m is negative and it will be situated on the negative side of the x axis. After you plot both points A and B, if the domain of the function is R (the set of real numbers), than you draw a line through A and B. We also can make a discution if b is greater than m and if b is smaller than m. If you need more help please let me know.
anna_p
29 March 2013
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