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maria [59]
2 years ago
7

How on the earth do you do this ????

Mathematics
2 answers:
Dafna1 [17]2 years ago
8 0
You basically solve one equation to get the answer to the other, which then will allow you to solve the previous equation to get your answer
julsineya [31]2 years ago
6 0
Alright, if it tells you to solve by substitution, you need to solve for either one of the variables (either x or y) in one of the equations. Let's say you solved for x. Then with the value of one of the variables (it will be an expression with y), you substitute it into the other equation in which you will get a value without variables as y. Now substitute that value y back into the first equation in which you solved for x to get the value of x.

So for 1)
5x + y = 0
y = -5x

Now plug -5x as y into the other equation -5x + y = -10
-5x -5x = -10
-10x = -10
x = 1

Now with x=1, plug that back into y=-5x.
y = -5(1)
y = -5
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-5(2b + 7) + b < -b - 11
Stells [14]
<span><span>-5(2b+7) + b < -b - 11</span>
<span>-10b - 35 + b < -b - 11

- 10b + b - 35 < -b - 11

-9b - 35 < -b - 11

- 9b + b < - 11 + 35 

-8b < 24

</span></span>\frac{-8b}{-8} \ \textless \  \frac{24}{-8}
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b < -3

Have a nice days.........</span></span>
8 0
3 years ago
What is the simplified form of this expression, written in scientific notation? (3.276×105)×400,000÷(3.9×106)
vlada-n [284]
(343.98)x400,000/(413.4)
137,592,000/413.4
332,830.188679
3 0
3 years ago
Read 2 more answers
PLEASE HELP AS SOON AS POSSIBLE
frutty [35]

Answer:

FALSE

TRUE

TRUE

Step-by-step explanation:

For median,

Arrange your numbers in numerical order.

Count how many numbers you have.

If you have an odd number, divide by 2 and round up to get the position of the median number.

If you have an even number, divide by 2. Go to the number in that position and average it with the number in the next higher position to get the median.

Source: https://www.verywellmind.com/how-to-identify-and-calculate-the-mean-median-or-mode-2795785

So for April median: 2.5, 3, 3.5, 3.5 (since we have 4 numbers we divide by 2 and we count by 2 places from left. Since we have even number data, we average 3 with the next higher position to get the median so (3+3.5)/2 = 3.25

For May apply same concept and you get median to be 2.25.

Median difference is 3.25-2.25 = 1

Therefore, statement 1 is false and statement 2 is true.

For average in May, add all numbers and divide by the number of data points so May= (2.5+3+3.5+3.5)/ 4 = 3.13

Apply same concept you for April and you get 2.38 as mean.

Mean difference is 3.13-2.38 = 0.75

Therefore, statement 3 is correct (true)

4 0
2 years ago
For a school play, 739 tickets valued at $857 were sold. Some cost $1 and others cost a $1.50. How many $1 tickets were sold?
balu736 [363]

Answer:

503 $1 tickets sold.

Step-by-step explanation:

Use two equations  

Let x = number of $1 tickets sold  

Let y = number of $1.50 tickets sold  

x + y = 739  

1x + (1.5)y = 857  

First equation ==> y = 739 - x  

Plug this into the second equation  

x + (1.5)(739 - x) = 857  

x + 1108.5 - 1.5x = 857  

- 0.5x = -251.5  

x = 503  

There were 503 $1 tickets sold.  

To find the number of $1.50 tickets, just plug this value of x into either one of the equations.  

(503) + y = 739       (739 - 503 = 236)

y = 236  

There were 236 $1.50 tickets sold.

3 0
3 years ago
Southern Florida has a mild climate. Which statement about the probability of snow in June in southern Florida is most likely tr
Allisa [31]

Answer:

The probability of snow is about 0.75

Step-by-step explanation:

5 0
3 years ago
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