how do you graph this equation: y + 3 = -3(x + 2)

Question

mathteacher1729 · Answer

The SUPER IMPORTANT POINT to remember when graphing a line:  

>>>>>
You need only TWO POINTS. 
>>>>>

So let's take  y + 3 = -3(x + 2) and set y = -3.  That means 0 = -3(x+2) and that means x must equal -2.  
POINT ONE: (-2, -3) 

Now the slope of this line is -3/1  (go down three, go over one)

So if we start from (-2,-3) and go down three, we land at (-2, -6) and if we go over one from that point we land at (-1, -6). 
POINT TWO: (-1,-6). 

Now plot those two points, and draw a line between them. :) 

Lemmie know if you have any questions about the process.

anonymous · Answer

i can't' go down -6 because the graph given only lets me go down to -3

mathteacher1729 · Answer

Ah, ok.  So here's what you do. 

"go down three and go over (right) one" also means "go UP three and go over (LEFT) one". 

Try that. :)

anonymous · Answer

ok i got it now, can you help me with this one? a deivery service charges a base price for an overnight delivery of a package plus an extra charge for each pound the package weighs. a customer is billed @22.85 for shipping a 3-pound package an $40 for shipping a 10-pound package, write an equation that gives the total cost of shipping a package as a function of the weight of the package

pokemon23 · Answer

http://www4b.wolframalpha.com/Calculate/MSP/MSP158919i68chcfb10i255000033i0g5h992be4c84?MSPStoreType=image/gif&s=5&w=200&h=204&cdf=RangeControl