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Andrej [43]
2 years ago
11

2х + 5y = 16 3х – 5y = - 1

Mathematics
1 answer:
storchak [24]2 years ago
3 0

Answer:

x=3; y=2

Step-by-step explanation:

2x+5y=16

   -5y   -5y

2x=-5y+16

/2   /2   /2

x=-\frac{5}{2}y+8

*substitute*

3(-\frac{5}{2}y+8)-5y=-1

-7\frac{1}{2}y+24-5y=-1

-12\frac{1}{2}y+24=-1

        -24  -24

-12.5y=-25

/-12.5    /-12.5

y=2

*replace*

2x+5(2)=16

2x+10=16

    -10   -10

2x=6

/2  /2

x=3

*solve to verify*

1. 2(3)+5(2)=16

6+10=16

16=16

2. 3(3)-5(2)=-1

9-10=-1

-1=-1

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2 years ago
How do you find the derivative of 1/logx?
valentina_108 [34]

The derivative of 1/logx is With the chain rule.

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The by-product of 1/log x is -1/x(log x)^2. Note that 1/logx is the reciprocal of log.

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5 0
1 year ago
Jimmy's height is 156 cm, Kessie's height is 168 cm, while Lya's height is 132 cm. Define:
Mumz [18]

Answer:

132<156<168 or 12×1, 12×2 ...

Step-by-step explanation:

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6 0
2 years ago
P’(rolling a number less than five and landing on tails)
Ksenya-84 [330]

Answer:

P’(rolling a number less than five and landing on tails) = 1/3

Step-by-step explanation:

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a coin has 2 side so the chance of getting tails is 1 in to or 1/2

therefore the probability of getting a number less than 5 and a tails is

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or you can do it this way:

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3 0
3 years ago
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torisob [31]

5x+20y=10\implies y=\dfrac12-\dfrac x4

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y-3=-\dfrac14(x-8)\implies y+\dfrac13x=5\implies x+3y=15

7 0
3 years ago
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