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N76 [4]
3 years ago
10

−x+3y=−15, 3x+3y=21 elimination

Mathematics
1 answer:
Vikentia [17]3 years ago
7 0

Answer: x= - 6/7, y= - 129/12

Explanation:

use the addition/elimination method to solve for x. then sub in and test then lastly, multiply everything by 7 to eliminate the fraction

You might be interested in
Which inequality is true when n=4?
Nadusha1986 [10]
To find out which inequality is true, we need to plug in n=4.

2n>6
2(4)>6
8>6

And since 8 is really greater than 6, this inequality is true! :)

n+3
<u />4+3 < 7
7 < 7

7 is not less than 7. So this inequality is false.

9- n \geq 13
9-4 \geq 13
5 \geq 13

5 is not greater than or equal to 13, so this inequality is false

\frac{n}{12}  \geq 3
\frac{4}{12} \geq 3
<u />\frac{1}{3} \geq 3

And 1/3 is not greater than 3, so this inequality is also false.
3 0
4 years ago
Can someone please help me? thank you
balandron [24]

Answer:

c = (ef-ab)/d

Step-by-step explanation:

ab+cd = ef

Subtract ab from each side

ab+cd -ab = ef-ab

cd = ef-ab

Divide by d

cd /d =(ef-ab)/d

c = (ef-ab)/d

8 0
3 years ago
Lisa and Ann are eating a box of crackers. Lisa eats 3/6 of the box, and Ann eats 1/4 of the box. How much of the box did the tw
sasho [114]

Answer:

the girls ate \frac{3}{4} of the box

Step-by-step explanation:

\frac{3}{6} = \frac{1}{2} = \frac{2}{4} ,,,\frac{1}{4} +\frac{2}{4} =\frac{3}{4}

7 0
3 years ago
5/8 to the power of the 2
MatroZZZ [7]
<span>2 <span>14/<span>25 as a mixed number decimal form is 2.56 and exact form is 64/25



hope i helped best of luck :)  </span></span></span>
<span />
8 0
3 years ago
2x-y=-6<br>3x-4y=-4<br>Solve using elimination and then substitution
Alinara [238K]
Okay, so first you are going to decide whether to solve for x or solve for y. I am going to solve for x. In order to do so, you must get x by itself.
2x-y=-6
2x=y-6[ [tex]3x-4y=-4
3x=4y-4 \\ x= \frac{4y-4}{3}
The next step is to set both equations equal to each other in order to find y.
\frac{y-\frac{y-6}{2}= \frac{4y-4}{3} \\ 3(y-6)=2(4y-4) \\ 3y-18=8y-8 \\ -10=5y \\ y=-26}{2} [/tex]

So now you know that y=-2. The next part is substitution. All you have to do is pick on of the equations and plug in the y value to get the x value.

So your answer to the question is (-4,-2). I hope I've helped you understand how to solve these types of problems. If you have any questions, don't hesitate to ask.

6 0
3 years ago
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