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Mashutka [201]
3 years ago
10

{-2x+y=0 5x+3y=-11 Solve the substitution

Mathematics
1 answer:
Rzqust [24]3 years ago
7 0

\bf \begin{cases} -2x+y=0\\ \boxed{y} = 2x\\[-0.5em] \hrulefill\\ 5x+3y=-11 \end{cases}\qquad \qquad \implies \stackrel{\textit{substituting on the 2nd equation}}{5x+3\left( \boxed{2x} \right)=-11} \\\\\\ 5x+6x=-11\implies 11x=-11\implies x = \cfrac{-11}{11}\implies \blacktriangleright x = -1 \blacktriangleleft \\\\\\ \stackrel{\textit{we know that}}{y = 2x}\implies \blacktriangleright y = -2 \blacktriangleleft \\\\[-0.35em] ~\dotfill\\\\ ~\hfill (-1~~,~~-2)~\hfill

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An electronic store sold 6% of the cell phones that were on sale. If only 21 cell phones were sold,
Korvikt [17]

Answer:

The answer is below

Step-by-step explanation:

Let x represent the number of phones that were on sale, given that 6% of the cell phones that were on sale, therefore:

number of cell phones sold = 6% of x = 0.06 × x = 0.06x

21 phones were sold, hence:

0.06x = 21

x = 21/0.06

x = 350 phones

This means that 350 cell phones were on sale.

Number of cell phones not sold = total number of cell phones that were on sale - number of cell phones sold

Number of cell phones not sold = 350 - 21

Number of cell phones not sold = 329

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Nikitich [7]

Answer:

x = 2.5

Step-by-step explanation:

4( x + 7) = 38

step 1 distribute the 4 to the x and 7

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we now have 4x + 28 = 38

step 2 subtract 28 from each side

28 - 28 cancels out

38 - 28 = 10

we now have 4x = 10

step 3 divide each side by 4

4x / 4 = x

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Answer:

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