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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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Add [1/5x-4+2y]+[2/5x+5-4y]=
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<h3>I'll teach you how to solve (1/5x-4+2y)+(2/5x+5-4y)</h3>

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(1/5x-4+2y)+(2/5x+5-4y)

Remove parentheses:

1/5x-4+2y + 2/5x+5-4y

Group like terms:

1/5x+2/5x+2y-4y-4+5

Add similar elements:

3/5x+2y-4y-4+5

Add similar elements:

3/5x-2y-4+5

Multiply:

3x/5-2y-4+5

Add subtract the numbers:

3x/5+1-2y

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3 years ago
Rewrite the expression using addition -17.9 - 4.2
Alexeev081 [22]

You can say -17.9+(-4.2)

5 0
3 years ago
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Answer:

volume = 1809 cm³

Step-by-step explanation:

The ratio of the height of two similar cylinder is 1:3 . The volume of the smaller cylinder is 67 cm³. The volume of the larger cylinder can be computed below:

If 2 object are similar and the ratio of the corresponding sides is x ,then the ratio of their volume is x³.

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volume of smaller cylinder/volume of larger cylinder = 1/27 = 67/x

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x = volume of the larger cylinder

x = 27 × 67

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4 years ago
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