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SSSSS [86.1K]
2 years ago
15

Need help now please

Mathematics
1 answer:
Marrrta [24]2 years ago
5 0

Answer:

all work is shown and pictured

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7x +2y = 24<br> 8x+2y= 30<br> What is x and y
Liula [17]

Answer:

x = 6

y = -9

Step-by-step explanation:

we have:

7x +2y = 24    equation 1

8x+2y= 30     equation 2

using equation 2 we have:

8x = 30 -2y

x=\frac{30-2y}{8}  equation 3

using equation 3 in equation 1 we have:

7(\frac{30-2y}{8})+2y = 24

\frac{210}{8} - \frac{14y}{8} +2y =24\\\\\frac{1}{4}y = -\frac{18}{8}  \\\\y=-\frac{18}{8} * 4\\\\y=-9

so we have:

x=\frac{30-2(-9)}{8}

x=\frac{30+18}{8}

x=6

7 0
3 years ago
Read 2 more answers
N/5 - 9n/10 = 1/5 <br> What does n equal ?
miskamm [114]
\frac{n}{5} - \frac{9n}{10} = \frac{1}{5}

\frac{n}{5}* \frac{2}{2}- \frac{9n}{10} = \frac{1}{5}

\frac{2n}{10}- \frac{9n}{10} = \frac{1}{5}

\frac{-7n}{10} = \frac{1}{5}       (multiply each side by 10)

-7n = 1/5 * 10

-7n = 10/5

-7n = 2          (divide eaach side by -7)

n = 2/-7

n =- \frac{2}{7} \ \textless \ -answer  (or about -0.286)


8 0
2 years ago
Read 2 more answers
(ACCOUNTING)
Dahasolnce [82]

Answer:

i believe it's a, it's marked as a deduction to your checking account

3 0
2 years ago
the mean of "n" numbers is "x" . if one more is added the mean is "y" . write an algebraic expression for the value of the numbe
vaieri [72.5K]

Answer:

yn +y -xn

Step-by-step explanation:

Mean= sum of numbers ÷number of numbers

x= sum of n numbers ÷n

<em>Multiply</em><em> </em><em>both</em><em> </em><em>sides</em><em> </em><em>by</em><em> </em><em>n</em><em>:</em>

xn= sum of n numbers

sum of n numbers= xn -----(1)

Let the number added be a.

After a has been added,

y= (sum of n numbers +a) ÷(n+1)

<em>Multiply</em><em> </em><em>both</em><em> </em><em>sides</em><em> </em><em>by</em><em> </em><em>(</em><em>n</em><em> </em><em>+</em><em>1</em><em>)</em><em>:</em>

y(n +1)= sum of n numbers +a

sum of n numbers= y(n +1) -a -----(2)

Substitute (1) into (2):

xn= y(n +1) -a

<em>Expand</em><em>:</em>

xn= yn +y -a

a= yn +y -xn

<u>Let's check!</u>

Let the numbers be 1, 2, 3 and 4.

mean, x= 10 ÷4= 2.5

n= 4

Let the new number added, a, be 7.

a= 7

mean, y= 17 ÷5= 3.4

a= yn +y -xn

a= 3.4(4) +3.4 -2.5(4)

a= 7

Thus, the expression is true.

3 0
2 years ago
Need help please it’s due today show work
kari74 [83]

Answer:

D. -(-2/9)

Step-by-step explanation:

Once you distribute the negative sign, it makes the same answer.

-2 times -1 = 2

9 times -1 = -9

2/-9

8 0
3 years ago
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