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llroberts43
 one year ago
I do not understand how to graph 3xy<4. I thought I was supposed to substitute 0 for x and solve for y and then substitute 0 for y and solve for x to come up with the intercepts. When I do that I end up with y=4 (0,4) and then I end up with 3x = 4 and I don't know what to do next because 3 won't go into 4.
llroberts43
 one year ago
I do not understand how to graph 3xy<4. I thought I was supposed to substitute 0 for x and solve for y and then substitute 0 for y and solve for x to come up with the intercepts. When I do that I end up with y=4 (0,4) and then I end up with 3x = 4 and I don't know what to do next because 3 won't go into 4.

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jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0to graph 3xy<4, we'll need to first graph 3xy=4 which is the boundary line

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0plugging in x = 0 leads to 3xy=4 3*0y = 4 0y = 4 y = 4 y = 4 so it should be (0,4) instead of (0,4)

llroberts43
 one year ago
Best ResponseYou've already chosen the best response.0Oh, I didn't know what to do with the negative sign so i ignored it

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0now let's plug in another x value, say x = 1 3xy=4 3*1y = 4 3y = 4 solve for y to get y = ??

llroberts43
 one year ago
Best ResponseYou've already chosen the best response.0What do I do with the 3?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0to move that over, you subtract 3 from both sides

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0yes if x = 1, then y = 1

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0so the two points (0,4) and (1,1) are on the graph of 3xy=4

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0plot the two points and draw a straight line through both of them. Extend the line out as far as you can in both directions

llroberts43
 one year ago
Best ResponseYou've already chosen the best response.0thank you. It's always something so small that I do wrong.

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0do you know how do to the shaded region?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0ok great, just checking
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