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Mamont248 [21]
3 years ago
15

50 POINTS I NEED THIS IM CONFUSED

Mathematics
1 answer:
Brilliant_brown [7]3 years ago
8 0
Ithe answer is 9 , -7
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PLease hurry! i need it! And the testing thing is happening, so before 6 pm?
ololo11 [35]

\begin{cases} -x+3y=9\\\\ y=\cfrac{2}{3}x \end{cases} \\\\[-0.35em] ~\dotfill\\\\ -x+3y=9\implies 3y=9+x\implies \underline{3y-9=x} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{substituting ont the 2nd equation}}{y=\cfrac{2}{3}(\underline{3y-9})\implies 3y=2(3y-9)}\implies 3y=6y-18\implies 18+3y=6y \\\\\\ 18=3y\implies \cfrac{18}{3}=y\implies \boxed{6=y}

8 0
3 years ago
Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number ?
KatRina [158]
X+y+z=22

(x+y+z+t)/4=8
subsitute
x+y+z=22
(22+t)/4=8
multiplly by 4
22+t=32
subtract 22
t=10

the fourth number is 10
3 0
3 years ago
Please help me with my question!!
AveGali [126]

Answer:

B

Step-by-step explanation:

To find the answer we add to the fractions

5/6 + 2/3 = 5/6 + 4/6 = 9/6 = 3/2 = 1 1/2

6 0
3 years ago
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Solve the inequality <br> V/3+12&gt;7
Ivanshal [37]

Answer:

V > -15

Step-by-step explanation:

\frac{V}{3} +12>7\\\\\frac{V}{3}>-5\\\\V>-15

7 0
3 years ago
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What is -2 as a decimal.
Artyom0805 [142]

Answer:

i think -0.02

Step-by-step explanation:

6 0
3 years ago
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