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ratelena [41]
4 years ago
7

What is 2x+y=8 and x-2y=-1

Mathematics
1 answer:
Dafna1 [17]4 years ago
4 0
The solutions of x and y?

2x+y=8...(1)
x-2y=-1...(2)
for (2), x=-1+2y...(3)
sub(3) into(1),
2(-1+2y) +y=8
-2+4y+y=8
5y=10
y=2
sub y=2 into(3)

x=-1+2(2) =3
therefore, x=3,y=2
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I need the answer to this !!
TEA [102]

Answer:

\sqrt{108}

or 10.39 rounded

Step-by-step explanation:

a²+b² =c²

6²+b²= 12²

36+b² = 144

-36 -36

b² = 108

\sqrt{108}

6 0
4 years ago
Expand and simplify (x-3)(2x+1)(x+1)
Eddi Din [679]
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<u>Step-by-step explanation:</u>

(x-3)(2x+1)(x+1)

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8 0
3 years ago
Tony’s fish weighs five pounds more than three times the weight of Mary’s fish. Let t represent the weight of Tony’s fish, and l
Temka [501]

t = 5 + 3m is the required expression that represents weight of Tony fish

<h3><u>Solution:</u></h3>

Let "t" represent the weight of Tony’s fish, and let "m" represent the weight of Mary’s fish

To find: expression that represents the weight of Tony's fish

According to given information,

Tony’s fish weighs five pounds more than three times the weight of Mary’s fish

Here the word "times" represents multiplication and "more than" represents addition

Weight of Tony fish = 5 + three times the weight of Mary’s fish

Weight of Tony fish = 5 + 3(m)

t = 5 + 3m

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6 0
4 years ago
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insens350 [35]

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Step-by-step explanation:

i think thats right

5 0
3 years ago
9. The first of three numbers is 12 more than the 2nd number and the 3rd number is triple the 2nd number. Their sum is 204 . Wha
Marianna [84]

Answer:

1) 50.4

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Step-by-step explanation:

1) x+12

2) x

3)3x

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2) 38.4

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50.4+38.4+115.2 = 204

7 0
3 years ago
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