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7nadin3 [17]
3 years ago
12

Solve the system of equations by elimination.

Mathematics
2 answers:
n200080 [17]3 years ago
4 0

Answer:

Step-by-step explanation:

1. 2x - 9y = 23

2 x = 9 y + 23

y = (2 x)/9 - 23/9

2 x - 9 y - 23 = 0

2. 5x - 3y = -1

5 x + 1 = 3 y

y = (5 x)/3 + 1/3

5 x - 3 y + 1 = 0

I belive that should help you out a bit :D

In-s [12.5K]3 years ago
4 0

Answer:

(x,y) = (-1/5 + 3v/5, -13/5+2v/15)

Step-by-step explanation:

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Which of the equations are true identities? A. N ( n − 2 ) ( n + 2 ) = n 3 − 4 n B. ( x + 1 ) 2 − 2 x + y 2 = x 2 + y 2 + 1
ICE Princess25 [194]

Answer:

Both A and B are true identities

Step-by-step explanation:

A. N ( n − 2 ) ( n + 2 ) = n 3 − 4 n

We need to show that (left-hand-side)L.H.S = R.H.S (right-hand-side)

So,

 n ( n − 2 ) ( n + 2 ) = n(n² - 2²)     (difference of two squares)

                               = n³ - 2²n       (expanding the brackets)

                               = n³ - 4n         (simplifying)

So,                L.H.S  = R.H.S

B. ( x + 1 )² − 2x + y² = x² + y² + 1

We need to show that (left-hand-side)L.H.S = R.H.S (right-hand-side)

So,

( x + 1 )² − 2x + y² = x² + 2x + 1 - 2x + y²   (expanding the brackets)

                             = x² + 2x - 2x + 1  + y²   (collecting like terms)

                             = x² + 1 + y²        

                             = x² + y² + 1                    (re-arranging)

So,              L.H.S  = R.H.S

So, both A and B are true identities since we have been able to show that L.H.S  = R.H.S in both situations.

7 0
3 years ago
In a mathematics class, half of the students scored 79 on an achievement test. With the exception of a few students
Yakvenalex [24]
In this situation, you have:
The mode is 79 (that’s the most common number).
The median is 78.5 (the middle value or the average of the two middle values, since there is an even number of test scores).
The mean is less than both of those, as it was brought down by the few scores of 49.

The means the mean will be less than median.

Answer: C
3 0
3 years ago
Proximately 32, 800 citizens of the country died in my automobile accident in 2015. Expressed this toll in deaths per day
Anton [14]
Remark
2015 is an odd numbered year. It is not a leap year. It has 365 days in it.

Equation
Total deaths = deaths / day * number of days

Givens
Total deaths = 32800
deaths / day = ???
number of days  = 365

Sub and solve
32800 = x * 365  Divide by sides by 365
32800 / 365 = x
x = 89.86 deaths per day.

Problem
Do you round up, down or leave the number as it is?

I would round up 90 deaths per day. 

Discussion 
Just how much are you out?
Total deaths in a year (rounded) = 90 * 365
Total deaths in a year (rounded)= 32850 which is 50 too many

Suppose you round down 
Total death/day = 89 * 365 = 39485 Rounding up is going to be better if you round at all.

Perhaps you should not round the answer at all and leave it at
89.86 <<<<< answer.
If you have choices, please list them.
5 0
3 years ago
Please help meee I need help
natta225 [31]

Answer:

5

6

Step-by-step explanation:

To solve, collect like terms

x ≥ 2 + 21/2

x ≥ 4 1/2

the whole number that would be greater than 41/2 would be 5

2.  2.7 + 3.3  > x

6 > x

8 0
4 years ago
Solve the system of equations.<br> 7x+10y=36<br> y=2x+9<br><br> x = ______<br><br> y = ______
wel

Step-by-step explanation:

Substitute the y in the 1st equation with the 2nd equation.

7x + 10(2x + 9) = 36

7x + 20x + 90 = 36

27x + 90 = 36

3x + 10 = 4

3x = -6

x = -2

So now we can find y.

y = 2x + 9 = 2(-2) + 9 = (-4) + 9 = 5.

So x = -2, y = 5.

6 0
4 years ago
Read 2 more answers
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