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Step2247 [10]
3 years ago
6

3x+2y=-15 2x=-18 elimination

Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
5 0

Answer: (-9,6)


Step-by-step explanation:

3x+2y=-15

2x=-18

First solve for x in second equation

2x=-18

2x/2=-18/2

X= -9

Now substitute your x into first equation to find y

3(-9)+2y= -15

-27+2y=-15

2y= -15+27

2y= 12

2y/2=12/2

Y= 6

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nika2105 [10]
-0.8 that is the answer hope it helps
3 0
4 years ago
A container has 12 and 3/4 cups of lemonade .asher gives each of his classmates 7/8 of a cup of lemonade . He gives away all of
Agata [3.3K]

Asher gave lemonade to 14 students

<em><u>Solution:</u></em>

Given that, A container has 12 and \frac{3}{4} cups of lemonade

Asher gives each of his classmates \frac{7}{8} of a cup of lemonade

To find: Number of classmates received the lemonade

From given question,

Total cups of lemonade = 12\frac{3}{4}

\rightarrow 12\frac{3}{4} = \frac{4 \times 12 + 3}{4} = \frac{51}{4}

cups of lemonade received by each classmate = \frac{7}{8}

Thus, number of classmates received the lemonade can be found by dividing total cups of lemonade by cups of lemonade received by each classmate

\rightarrow \frac{\frac{51}{4}}{\frac{7}{8}}=\frac{51}{4} \times \frac{8}{7}

\rightarrow 14.57

Thus Asher gave lemonade to 14 students

3 0
3 years ago
Question 5: How long will it take for 2 g of a sample of iodine-131, which has a half-life of about 8 days, to decay to 0.04 g?
Aleonysh [2.5K]

This problem can be represented through the following equation

A = A₀(1/2)^t/h

where

A----------->  is the amount of substance left after time t

A₀ ----------> is the original amount---------> 2 g

h------------->  is the half-life-----------> 8 days

for A=0.04 g

t=?

0.04 = 2(1/2)^t/8

0.02 = (1/2)^t/8

Take ln on both sides:

ln(0.02) = ln [(1/2)^t/8]

ln(0.02) = (t/8)(ln 1/2)

t = 8*ln(0.02)/ln(1/2)

t = 45.15 days

the answer is 45.15 days

4 0
3 years ago
1/6(a+12)= -4 please help because I don’t understand this
iogann1982 [59]

Answer:

a=-36

Step-by-step explanation:

1/6(a+12)=-4

1) Distribute <u>1/6</u> to a and 12:

1/6a+2=-4

2) Subtract 2 from both sides:

1/6a=-6

3) Multiply both sides by the reciprocal of 1/6: (6/1)

a=-36

Let me know if you have any confusion on how I reached the solution :)

3 0
3 years ago
Solve this problem 5x+6y=60
12345 [234]

Answer:

if the outputs can be whole number then,

(x,y) = (0, 10) or (6,5) or (12,0)

if the outputs can be natural number then,

(x,y) = (6,5)

6 0
3 years ago
Read 2 more answers
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