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solniwko [45]
3 years ago
8

-3x+7=6x-2 What would the variable be?

Mathematics
1 answer:
Solnce55 [7]3 years ago
5 0
<span>-3x+7=6x-2
-3x+(-6x)=-7+(-2)
-9x=-9
x=1</span>
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4x-y+2z=-6,-2x+3y-z=8,2y+3z=-5
Anit [1.1K]
From third equation count y:
2y+3z=-5 \\ 2y=-5-3z \qquad /:2 \\ y=\frac{-5-3z}{2}
From first equation count x:
4x-y+2z=-6 \\ 4x=-6-2z+y \qquad /:4 \\ x=\frac{-6-2z+y}{4}
Substitute "y", which is counted from third equation:
x=\frac{-6-2z+\frac{-5-3z}{2}}{4}=\frac{-\frac{12}{2}-\frac{4z}{2}+\frac{-5-3z}{2}}{4}=\frac{-12-4z-5-3z}{8}=\frac{-7z-17}{8}
So now you've got:
y=\frac{-5-3z}{2} \\ x=\frac{-z-7}{8} \ \\ \hbox{Substitute this to second equation:} \\  -2 \cdot \frac{-7z-17}{8}+3 \cdot \frac{-5-3z}{2}-z=8  \\ \frac{7z+17}{4}+\frac{-15-9z}{2}-z=8 \qquad /\cdot 4 \\ 7z+17-30-18z-4z=32 \\ -15z-13=32 \\ -15z=45 \qquad /:(-15) \\ z=-3 \\ x=\frac{3-7}{8}=\frac{4}{8}=\frac{1}{2} \\ y=\frac{-5+9}{2}=\frac{4}{2}=2
So the solution is:
\begin{cases} x=\frac{1}{2} \\ y=2 \\ z=-3 \end{cases}
5 0
3 years ago
The area of a rectangle is 259 cm sq and its length is 18.5cm find its breadth and perimeter
Zigmanuir [339]

Answer:

Step-by-step explanation:

let it's breadth be x

area of rectabgle=l*b

259=18.5*b

259/18.5=b

14=b

perimeter of rectangle=2(l+b)

=2(18.5+14)

=2*32.5

=65 cm

6 0
2 years ago
Read 2 more answers
Find the value of x<br> 50<br> x
finlep [7]
The value of X is 80
6 0
2 years ago
Help please
Ede4ka [16]

Answer: A: 1524 miles B: Average is 508 mph

Step-by-step explanation: Add the miles on the picture to get the total amount of miles traveled (1524) and then divide by 3 hours to get 508 mph.

Hope this helped!

Mark Brainliest if you want!

4 0
3 years ago
​6 2/3÷1/5 juuuuuuuuuuuuuuu
MAXImum [283]

Answer:

Exact Form:

100/3

Decimal Form:

33.3

Mixed Number Form:

33 1/3

<em><u>i hope this helped at all.</u></em>

7 0
3 years ago
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