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nlexa [21]
3 years ago
14

X + y = 7 x - 3y = 5

Mathematics
2 answers:
taurus [48]3 years ago
7 0

Answer:

x+y=7

x-3y=5

0+4y=12

4y=12

y=3

x+y=12

x+4=12

x=12-4

x=8

x=8,y=3

OLEGan [10]3 years ago
4 0

Answer:

x= 3.5 y=1.5

Step-by-step explanation:

plug in answers to check

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Answer:

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Step-by-step explanation:

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8 0
3 years ago
As notas de dois alunos X e Y estão representadas no quadro abaixo. Por meio da variância, qual deles apresentou ser o mais regu
Reil [10]

Answer:

Aluno X

Step-by-step explanation:

A nota média para os alunos X e Y são, respectivamente:

X_m=\frac{5+3+5+7}{4}=5 \\Y_m=\frac{4+9+4+3}{4}=5

A variância é definida pela seguinte expressão:

V=\frac{\sum(X_i-X_m)^2}{n-1}

Onde n é o numero de termos, neste caso, n = 4.

As variâncias para cada aluno são:

V_x=\frac{(5-5)^2+(3-5)^2+(5-5)^2+(7-5)^2}{4-1} \\V_x= 2.7\\V_y=\frac{(4-5)^2+(9-5)^2+(4-5)^2+(3-5)^2}{4-1} \\V_y= 7.3

O aluno X apresentou uma variância menor do que o aluno Y em suas notas e, portanto, apresentou ser o mais regular.

6 0
3 years ago
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7 0
3 years ago
How do you solve (7-2)/5 step by step
gtnhenbr [62]
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The answer would be 1.
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4 years ago
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