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BigorU [14]
3 years ago
13

All questions are about this system of equations:

Mathematics
1 answer:
sertanlavr [38]3 years ago
6 0
If we are eliminating x, we would multiply the 2nd equation by -5

5x + 18y = 23
x + 3y = 2....multiply by -5
-----------------
5x + 18y = 23
-5x - 15y = - 10 (result of multiplying by -5)
----------------add
0 + 3y = 13.....bye-bye x :)

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Help please jggvnhujff
saveliy_v [14]

Answer:

Step-by-step explanation:

<u><em>8).</em></u>  \left \{ {{4x+3y=1} \atop {x+y=2}} \right.

<em>(2)</em> × [ - 3 ]

4x + 3y = 1 ........ <em>(3)</em>

- 3x - 3y = - 6 .... <em>(4)</em>

<em>(3)</em> + <em>(4)</em>

x = - 5

- 5 + y = 2 ⇒ y = 7

<em>( - 5 , 7 )</em>

<u><em>9).</em></u> \left \{ {{-9x+3y=18} \atop {2x+y=-4}} \right.

<em>(1)</em> ÷ [- 3]

3x - y = - 6  ......... <em>(3)</em>

2x + y = - 4 ........ <em>(4)</em>

<em>(3)</em> + <em>(4)</em>

5x = - 10 ⇒ x = - 2

2(- 2) + y = - 4 ⇒ y = 0

<em>(- 2, 0)</em>

<u><em>10).</em></u> \left \{ {{x-2y=14} \atop {10x-6y=0}} \right.

<em>(2)</em> ÷ 10

x - 0.6y = 0 ⇒ x = 0.6y -----> <em>(1)</em>

0.6y - 2y = 14

- 1.4y = 14

y = - 10

x - 2(- 10) = 14 ⇒ x = - 6

<em>(- 6, - 10)</em>

Now is your turn, you can do it!!

3 0
3 years ago
Consider the expressions 7y + 5 − 3 and 7y + 2. Which statement is true?
romanna [79]
The two expressions are equivalent because they have the same value regardless of the number of substituted in for y
4 0
2 years ago
7th grade Math Help Thank You
Nataly_w [17]
D because 3/4 is .75 so 7.75 divided by .75 equals 10.333333333333333
6 0
3 years ago
What are the coordinates of the pre-image of N' if it was reflected across the y-axis, and N' has coordinates (3, -1)?
kirill115 [55]
I believe it is (-3,-1)
5 0
3 years ago
Read 2 more answers
What is the domain of the ordered pair shown in the graph?
Margaret [11]

Answer:

D.

Step-by-step explanation:

It is the only one that contains all the x-values of the points. (Domain is the set of x-values).

6 0
2 years ago
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