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BlackZzzverrR [31]
3 years ago
14

–7x + 8y = 1

Mathematics
2 answers:
Mademuasel [1]3 years ago
8 0

Answer: -6

Step-by-step explanation:

First, try deleting the x-coordinate from the equations by making them the same number. By doing that I multiplied the first equation (-7x+8y=1) by 4 and (4x-8y=20) by 7. That got me -28x+32y=4 and +28x-56y=140. You could cross out the 28 which gets +32y=4 and -56y=140. Then add up both equations. It’s gets you -24y=144

-24y=144

—————— then divide by -24

-24 -24

144/-24=-6

Hope this helped!

Step2247 [10]3 years ago
4 0

\bf \begin{cases} -7x+8y=1\\ 4x-8y=20 \end{cases}\qquad \qquad \stackrel{\textit{using elimination}}{ \begin{array}{llll} -7x~~\begin{matrix} +8y \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~=1\\ ~~4x~~\begin{matrix} -8y \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~=20\\ \cline{1-1}\\ -3x~\hfill =21 \end{array}}

\bf x=\cfrac{21}{-3}\implies \blacktriangleright x=-7 \blacktriangleleft \\\\\\ \stackrel{\textit{substituting in the 2nd equation}}{4(-7)-8y=20}\implies -28-8y=20\implies -8y=48 \\\\\\ y=\cfrac{48}{-8}\implies \blacktriangleright y = -6 \blacktriangleleft

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Options of Answer
Naya [18.7K]

Answer:

D) 18 bags of chips and 6 jars of salsa

Step-by-step explanation:

Given :  The networking organization you joined is throwing a party. You are in charge of buying the chips, which cost $2.50 per bag and salsa, which costs $4 per jar. The chips & salsa budget you are given totals $60.

Inequality: 2.5x+4y ≤ 60

Solution :

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Option a: 10 bags of chips and 2 jars of salsa

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Putting values in inequality

2.5(10)+4(2) ≤60

25+8 ≤60

33≤60

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Option c : 14 bags of chips and 5 jars of salsa

so, x = 14 and y =5

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Option c : 14 bags of chips and 5 jars of salsa

so, x = 14 and y =5

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2.5(14)+4(5)≤60

35+20≤60

55≤60

Hence it is correct.

Option d :18 bags of chips and 6 jars of salsa

so, x = 18 and y =6

Putting values in inequality

2.5(18)+4(6)≤60

45+24≤60

69\geq 60

Hence it is not correct since it violates the inequality

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3 years ago
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