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Paraphin [41]
4 years ago
15

X + 3y = −1 2x + 2y = 6

Mathematics
1 answer:
hram777 [196]4 years ago
5 0
\left\{\begin{array}{ccc}x+3y=-1\\2x+2y=6&|divide\ both\ sides\ by\ (-2)\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}x+3y=-1\\-x-y=-3\end{array}\right}\\.\ \ \ \ \ \ \ \ \ 2y=-4\ \ \ \ |divide\ both\ sides\ by\ 2\\.\ \ \ \ \  \ \ \ \ \fbox{y=-2}\\\\subtitute\ the\ value\ of\ y\ to\ the\ equation\ x+3y=-1\\\\x+3\cdot(-2)=-1\\x-6=-1\ \ \ \ |add\ 6\ to\ both\ sides\\\fbox{x=5}\\\\Answer:\boxed{x=5\ and\ y=-2}
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A recipe calls for a total of 3 2/3 cup flour and sugar.if the recipe calls for 1/4 cups of sugar,how much flour does he need
viva [34]
You'll want to convert 3 2/3 into a common denominator with 1/4.
The nearest common denominator of 3 and 4 is 12. 
1/4 * 3/3 = 3/12
2/3 * 4/4 = 8/12
You need 3 and 8/12 in total so subtract 3/12 from 3 8/12 to get the flour
3 8/12 - 3/12 = 3 5/12.
You would need 3 5/12 cups of flour.
6 0
4 years ago
Pls help! <br><br> substitute x = 2 and y = 4 into the following and evaluate.<br> 12/x + 10xy/2
ankoles [38]

Answer:

46 is the answer.

Step-by-step explanation:

12/(2) + 10(2)(4)/2

= 12/(2) + 80/2

= 6 + 40

= 46

4 0
3 years ago
vik wrote the equation 470 h equals 3,008 where h is the number of hours it took a plane flying at a constant speed of 470 miles
Hunter-Best [27]
As with any linear equation of this sort, divide by the coefficient of the variable.
.. 470 h = 3008
.. (470 h)/470 = 3008/470
.. h = 3008/470 = 6.4
4 0
3 years ago
Find the area of the parallelogram.<br> 1.<br> 4 m<br> 4 m
PolarNik [594]

Answer:

8m

Step-by-step explanation:

Doblehin mo

1+1=2

2+2=4

4+4=8

tnx me later and pa brainliest

7 0
4 years ago
Sarah and Sunil are racing to see who is a faster dishwasher. Sarah cleaned 18 dishes in 10 minutes. Sunil cleaned 30 in 18 minu
Luba_88 [7]

Answer:

1.8 dishes per minute (Sarah)

1.67 dishes per minute (Sunil)

Step-by-step explanation:

We can find the rate by dividing the number of dishes by the number of minutes:

18/10 = 1.8 dishes per minute

30/18 = 1.67 dishes per minute

3 0
4 years ago
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