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Vedmedyk [2.9K]
4 years ago
6

Solve this equation by the substitution method f(x)={2x+3y=25, {x-y=5

Mathematics
2 answers:
Kipish [7]4 years ago
8 0
The second equation is perfect. We can add y to both sides to make the equation equal x.
X=5+y; let's plug that in for x in the first equation.
2(5+y)+3y=25
10+2y+3y=25
5y+10=25
Let's subtract 10 from both sides.
5y=15
Now divide both sides by 5.
Y=3
So y is 3. We can plug 3 in for y in the second equation.
X-3=5
X=8
So, X=8 and Y=3.
Katyanochek1 [597]4 years ago
5 0
2x + 3y = 25
x - y = 5


x-y = 5 [make x the subject]
x= 5 +y

Now substitute,
2(5+y) + 3y =25
10 + 2y + 3y =25
10 + 5y = 25
5y = 25-10
5y=15
y=15÷5
y=3

Now to find x, substitute the value of y

x = 5 +y
x = 5 +3
x = 8

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The number of freshman at George Washington high school is 60 greater than the number of sophomores. If there are 1250 students
solmaris [256]

Answer:

Hence total number freshman presented are 655.

The system is relative system as there is correlation between freshman and

sophomores<em>.</em><em>( as freshman are 60 more than the Sophomores)</em>

Step-by-step explanation:

Given:

1250 total students of sophomores and freshman.

To Find:

freshman count and its type of system used.

Solution:

We have that ,

consider x be the no.of freshman and y be the sophomores

So by given condition,

x+y=1250        ,..............................Equation(1)

And other one,

x=60+y

Use above value in equation (1) we get ,

60+y+y=1250

2y=1250-60

y=595

Now number of freshman ,

x+y=1250

x=1250-595

x=655

Hence total number freshman presented are 655.

The system represent the relative proportion system.The break even and total value should include all students in university .

Relative means in relationship with one another .

As there are 60 more number of freshman than the sophomores.

3 0
3 years ago
If two 6-sided dice are rolled, what is the<br> probability of rolling double 2s?
Komok [63]

16.7%

There are 6 ways we can roll doubles out of a possible 36 rolls (6 x 6), for a probability of 6/36, or 1/6, on any roll of two fair dice. So you have a 16.7% probability of rolling doubles with 2 fair six-sided dice.

3 0
3 years ago
Read 2 more answers
A ball was drawn from a bag containing 10 red, 30 white, 20 blue, and 15 yellow balls. what is the probability that it is neithe
Wittaler [7]
There are a total of 75 balls in the bag.

45 of these balls are neither red nor blue.

45/75 = .60

There is a 60% chance that a ball that in not red or blue will be chosen.

Hope this helps!
7 0
4 years ago
Please help!!! asap ( 15 pts!!)
DENIUS [597]

Answer:

A) 40

B) 96

C) 60

D) 70

:)


6 0
3 years ago
If the square of twice a number is 81, what is the number? I tried doing 2x^2=81 but that did not come out to the answer 4.5,-4.
Vlada [557]
If the number is n then

square of 2 times a number
square of 2n
(2n)²
that was your mistake, because (2n)²=4n², not 2n²

the result is 81
(2n)²=81
square root both sides
remember positive and negative roots
2n=+/-9
divide by 2
n=+/-4.5

n=4.5 or -4.5
4 0
4 years ago
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