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netineya [11]
2 years ago
5

I dont get this question at all and i need help! thanks if u help me!

Mathematics
1 answer:
m_a_m_a [10]2 years ago
8 0
C. The cost of 5 notebooks is less than the cost of 3 + a $2 pen.

Process of elimination:
The greater or less than sign is open towards 3x + 2.

Get rid of the ones that say 5x is greater .

So A. And D. Are not an option

Now you have to put the pieces together.

Answer B. Sounds right until you get to the “$2-off coupon”

In the equation above it says 3x PLUS 2.
$2 off means subtraction. So we automatically know C is the only other answer.
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Step-by-step explanation:

\left \{ {{3x^2+4y=17} \atop {2x^2+5y=2}} \right. \\\\Then\\\\\left \{ {{2 \times (3x^2+4y)=2 \times 17} \atop {3\times(2x^2+5y)=3\times2}} \right. \\\\\left \{ {{6x^2+8y=34 \quad (1)} \atop {6x^2+15y=6\quad (2)}} \right.\\\\(1)-(2) \Rightarrow -7y=28 \Rightarrow y =-4.\\Since \: \:  2x^2+5y=2 \Rightarrow 2x^2=2-5y\\\Rightarrow 2x^2=2+20=22\\\Rightarrow x^2=22:2=11\\\Rightarrow x=\pm \sqrt{11}.

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Step-by-step explanation:

Okay!

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