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Alchen [17]
4 years ago
9

How to solve -5/7-11/7x=-y 2y=7+5x

Mathematics
1 answer:
Oliga [24]4 years ago
6 0
\left\{\begin{array}{ccc}-\frac{5}{7}-\frac{11}{7}x=-y&/\cdot(-1)\\2y=7+5x\end{array}\right\\\left\{\begin{array}{ccc}\frac{5}{7}+\frac{11}{7}x=y\\2y=7+5x\end{array}\right\\\\substitute\\\\2\cdot\left(\frac{5}{7}+\frac{11}{7}x\right)=7+5x\\\\\frac{10}{7}+\frac{22}{7}x=7+5x\ \ \ /\cdot7\\\\10+22x=49+35x\\\\22x-35x=49-10\\\\-13x=39\ \ \ /:(-13)\\\\x=-3

\left\{\begin{array}{ccc}x=-3\\y=\frac{5}{7}+\frac{11}{7}x\end{array}\right\\\left\{\begin{array}{ccc}x=-3\\y=\frac{5}{7}+\frac{11}{7}\cdot(-3)\end{array}\right\\\left\{\begin{array}{ccc}x=-3\\y=\frac{5}{7}-\frac{33}{7}\end{array}\right\\\left\{\begin{array}{ccc}x=-3\\y=-\frac{28}{7}\end{array}\right\\\left\{\begin{array}{ccc}x=-3\\y=-4\end{array}\right
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Anna11 [10]

Answer:

30 more students

Step-by-step explanation:

690 + 30 = 720

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8 0
4 years ago
I need help on JUST number 13. I am begging you please, please help me.
Svetradugi [14.3K]

Answer:

C. 6%

Step-by-step explanation:

You have to multiply 36 by A,B,C,D. Then add that number to 36.

First multiply all the options by the original price ($36)

A. 2.16% = 36 x 2.16% = 0.7776....this answer plus our original answer isn’t 38.16

B. 9.4% = 36 x 9.4% = 3.384....This answer plus 36 doesn’t equal 38.16

C. 6% = 36 x 6% = 2.16....2.16 plus 36 equals 38.16

D. 8% = 36 x 8% = 2.88....doesn’t equal 38.16 when added to 36.

Therefore 6% or C is the correct answer.

3 0
3 years ago
A six sided die is rolled three times. Find the probability that the result is an even number for every roll.
bogdanovich [222]

|\Omega|=6^3\\|A|=3^3\\\\P(A)=\dfrac{3^3}{6^3}=\left(\dfrac{3}{6}\right)^3=\left(\dfrac{1}{2}\right)^3=\dfrac{1}{8}=12.5\%

4 0
3 years ago
Hey i need help please
Zanzabum
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5 0
4 years ago
I think its D, am I correct? plzz answer quickly!
serg [7]
The answer is the second option:
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4 0
3 years ago
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