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Nikitich [7]
3 years ago
12

To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before ad

ding the equations together? First Equation: 5x − 4y = 28 Second equation: 3x - 9y = 30
Mathematics
2 answers:
jek_recluse [69]3 years ago
8 0

Answer:

The first equation should be multiplied by 9 and the second equation by −4.

Step-by-step explanation:

vovikov84 [41]3 years ago
6 0

Answer:

use -9 to multiply the first equation

use -4 to multiply the second equation.

Step-by-step explanation:

5x-4y=28.....eqn (1)×-9

3x-9y=30....eqn(2)×-4

-45x+36y=-252

-(-12x+36y=-120)

therefore, -33x÷33 =-132÷-33

x=4.

substitute (x=4) in any of the equation. I'm just going to use eqn 1.

5x-4y=28

5(4)-4y=28

20-4y=28

-4y =28-20

-4y÷-4 = 8÷-4

y=-2

so, x=4, y=-2

Note: for proof of answers substitute the answers for x and y and see if you have the same result...e.g

5(4)-4(-2)=28.

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Answer: C

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C(x)={3x+100, x>20

9 0
4 years ago
49 Which of the following is a measure
Mariulka [41]

ok

we are ask for measuring of center

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mode, when the data value occurs the most frequently

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4 0
2 years ago
Vol=1348.79cm³. What's X? (Height)
ale4655 [162]
V = PI x r^2 x H

1348.79 = 3.14 x 5.5^2 x H

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4 0
4 years ago
Dan has 4 over 5 cup of ice cream. How many 1 over 8 -cup servings are in 4 over 5 cup of ice cream?
Alik [6]

Answer:

32/5

Step-by-step explanation:

To find this, we'll have to <em>divide</em> 4/5 <em>by</em> 1/8.

This is 4/5 / 1/8, which is 4/5 * 8.

That equals 32/5 :)

4 0
3 years ago
Larry Thomas's charge account statement shows an unpaid balance of $800. The monthly finance charge is 1.5% of the unpaid balanc
lilavasa [31]

Answer:

The new account balance is <u>$812</u>.

Step-by-step explanation:

Given:

Larry Thomas's charge account statement shows an unpaid balance of $800.

The monthly finance charge is 1.5% of the unpaid balance.

Now, to find the new account balance.

Unpaid balance = $800.

Monthly finance charge of the unpaid balance = 1.5%.

Now, to get the new account balance:

$800 + 1.5% of $800.

=800+\frac{1.5}{100} \times 800.

=800+0.015\times 800.

=800+12.

=\$812.

Therefore, the new account balance is $812.

5 0
4 years ago
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