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Lana71 [14]
3 years ago
10

35 POINTS! Arrange the steps in the correct sequence: x + y = -2 2x - 3y = -9

Mathematics
1 answer:
lubasha [3.4K]3 years ago
3 0

\left\{\begin{array}{ccc}x+y=-2\\2x-3y=-9\end{array}\right\\\\\text{multiply the first equation by 3}\\3(x+y)=3(-2)\qquad|\text{use distributive property}\\3x+3y=-6\\\\\underline{+\left\{\begin{array}{ccc}3x+3y=-6\\2x-3y=-9\end{array}\right}\qquad\text{add 3x+3y=-6 to 2x-3y=-9, and solve for x}\\.\qquad5x=-15\qquad|:5\\.\qquad x=-3\\\\\text{Substitute the value of x in the first equation (x+y=-2)}\\\\-3+y=-2\qquad|+3\\y=1\\\\\text{The solution for the system of equations is (-3, 1)}

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Even : 382, 138

Odd: 550, 227, 489
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(2.5 × 10^{-10} ) × (7 × 10^{-6} )

First, simplify brackets. / Your problem should look like: 2.5 × 10^{-10} × 7 × 10^{-6}
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Third, simplify exponent. / Your problem should look like: 17.5 × 10^{-15}

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Two families bought tickets for the big football game. One family ordered 2 adult tickets and 3 children's tickets for a total o
fenix001 [56]

The cost per adult ticket is $13 and the cost per children ticket is $8

Step-by-step explanation:

Let the cost of adult tickets be 'x'

Let the cost of children tickets be 'y'

2x + 3y = 50

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x = (50 - 3y) /2

3x + 4y = 71

[3(50-3y) /2 ]+ 4y = 71

(150 - 9y) /2 + 4y = 71

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y = 150 - 142

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x = (50-3y) /2

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6 0
4 years ago
5x( 4y2 + 5z) – (4y2 + 52
mrs_skeptik [129]

Hello! :)

To solve your equation, we will simplify

5 x (4y^2 + 5z) - (4y^2 +52)

Let's Distribute the negative sign

5 x (4y^2 + 5z) + −1 (4y^2 + 52)

5x (4y^2 + 5z) + −1 (4y^2) + (−1) (52)

5x (4y^2 + 5z) + −4y^2 + −52

Now, we will Distribute

(5x) (4y2)+(5x) (5z) + -4y^2 + -52

20xy^2 + 25xz + −4y^2 + −52

Hope this helped you!

THEDIPER

3 0
4 years ago
The wages
mihalych1998 [28]

Answer:

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Step-by-step explanation:

the formula would be :

w = n * r

finding the wages for 20 hours at a rate of 7.20 hours can be solved like this:

w = n *r

w = 7.20 * 20

<u>w =£ 144</u>

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8 0
3 years ago
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