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vazorg [7]
3 years ago
14

Question 4 of 25 Use the substitution method to solve the system of equations the correct ordered par x+y=5 y=7​

Mathematics
1 answer:
alex41 [277]3 years ago
8 0

Answer:

x = -2

y = 7

Step-by-step explanation:

x+y=5

y=7​

x+y=5

x + 7 = 5

x = -2

x+y=5

-2 + y = 5

y = 7

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alex spent 3/7 of his money he gave 1 /4 of the remainder to his sistet he haf $120 left how much money did he in the beginning
Sonbull [250]
Let his total money be x.
He spent (3/7)*x of his money.
He gave 1/4(x-3/7x) to his sister. 
which is : (1/4)*(4/7)*x = (1/7)*x 
Now,
How much money he have in the beginning = 
(3/7)*x+(1/7)*x+120=x
(4/7)*x+120=x
120=x-(4/7)*x
120=(3/7)*x
x=120*7/3 [cross multiplication]
x=280.

So, Alex had $280 in the beginning.

6 0
4 years ago
Y= x + 4
Mice21 [21]

Answer:

Step-by-step explanation:

Simplifying

2x + 4y = 13

Solving

2x + 4y = 13

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4y' to each side of the equation.

2x + 4y + -4y = 13 + -4y

Combine like terms: 4y + -4y = 0

2x + 0 = 13 + -4y

2x = 13 + -4y

Divide each side by '2'.

x = 6.5 + -2y

Simplifying

x = 6.5 + -2y

(Hope this helped!)

6 0
4 years ago
A car tire has a diameter of 16 inches. How many inches will the tire travel in 2 full rotations
Lunna [17]

I will take 6.28 to rotations

5 0
3 years ago
How would i simiplify 33/128
irakobra [83]
Find a number that goes into both numbers. There are none for this example. So 33/128 is in it's simplest form
8 0
3 years ago
I need help with this math problem and how you solved it...
Galina-37 [17]
To get angle Y, you have to do 90 - 27 to get the other angle in the triangle and you get 63. Then you do 180 - (63+51) which is 66. 

Angle Y = 66
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4 years ago
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