unheard
Which of the following points lie in the solution set to the following system of inequalities?
y less than or equal to x - 5
y greater than or equal to -x - 4
(-5, 2)
(5, -2)
(-5, -2)
(5, 2)
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unheard
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@amistre64 @Callisto @phi
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@AravindG
AravindG
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Did you graph them and found the solution region?
unheard
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No, How would I do that?
Peter14
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use graph paper
graph the lines y=x-5 and y=-x-4
AravindG
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yep
Peter14
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find the region below or on the line y=x-5 and above or on the line y=-x-4
AravindG
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you could also use a graphing calculator
unheard
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I'm in a library, so I don't have graphing paper, and I have no clue how to use a graphing calculator. :/
AravindG
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its easy just plugin the quations in boxes y1 and y2
AravindG
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*equations
unheard
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Okay. I'll try it right now;
unheard
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How do I make a less than or equal too sign on the graphing calculator?
Peter14
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you don't need to, just graph the line and remember you are looking at the region less than or equal to it
AravindG
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In my calculator click on the square having equal to after the y1 or y2
unheard
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I'm so confused > . <
Peter14
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in desmos, enter the less than sign then the equals sign
<= or >=
unheard
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Okay, I'm gonna use desmos then.
AravindG
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ok.
unheard
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I did it. What next?
Peter14
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you typed in both your equations?
unheard
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Yes.
Peter14
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look at where your four points are
Peter14
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see which one satisfies both inequalities
unheard
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0,5 and -4,5
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@Peter14
amistre64
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i woulda just plugged in the 4 points to see what made true results
amistre64
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(-5, 2)
is 2 <= -5 - 5 true?
is 2 >= --5 - 4 true?
(5, -2)
is -2 <= 5 - 5 true?
is -2 >= -5 - 4 true?
(-5, -2)
is -2 <= -5 - 5 true?
is -2 >= --5 - 4 true?
(5, 2)
is 2 <= 5 - 5 true?
is 2 >= -5 - 4 true?
unheard
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Oh, okay! @amistre64 I'll try that,
amistre64
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it is nice to know that other stuff, but it takes way to much time when taking a test.
unheard
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It's -5, -2, right?
amistre64
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(-5, -2)
-2 <= 0 true
-2 >= 1 false
not that one
amistre64
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well, -10 up top, but still false :)
unheard
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So, it's -5, something right?
amistre64
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dunno, lets try another one
(5, -2)
-2 <= 5 - 5
-2 <= 0 true
-2 >= -5 - 4
-2 >= -9 true
that fits nicely
unheard
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Awesome. Thanks :)