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zvonat [6]
3 years ago
12

For the following system, use the second equation to make a substitution for y in the first equation. 2x + y = 5 y + 3 = 2x

Mathematics
2 answers:
deff fn [24]3 years ago
7 0
For the second equation, y=2x-3. Substituting this in, you get 2x+2x-3=5. Add the 2x's (4x), and add 3 to the 5 (8). You should get 4x=8, which will give you x=2.  
Alla [95]3 years ago
6 0
If y equals 2x - 3 in the second equation, than subsitute it in for y in the first.
2x + 2x - 3 = 5
4x - 3 = 5
4x = 8
x=2
2(2) + y = 5
x = 2 and y = 1

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Is 43/10 an irrational number or rational number ?
RideAnS [48]

Answer:

Rational

Step-by-step explanation:

The definition of rational is that it can be written as a fraction where the top and bottom are integers (the bottom integer not 0).

--

43/10 is written in that form since 43 and 10 are both integers.

5 0
3 years ago
Each month, a phone company charges $20 for 500 minutes of talk time plus $0.45 for each additional minute. Unlimited texting co
slavikrds [6]

Answer:

Hello there! I hope your having a good day. I'm not exactly sure about this answer: 50o=30 u+(20m+.45a)

Step-by-step explanation:

8 0
2 years ago
Mikayla is a waitress who makes a guaranteed $50 per day in addition to tips of 20% of all her weekly customer receipts, t. She
notsponge [240]

Answer:

D. f(t)=300+0.20t

Step-by-step explanation:

We have been given that Mikayla is a waitress who makes a guaranteed $50 per day.

Since Miklaya works  6 days per week, so the guaranteed income for one week would be \$50\times 6=\$300  

We are also told that she gets tips of 20% of all her weekly customer receipts, t. So amount earned from tips would be 20% of t, that is \frac{20}{100}t=0.20t.

Total amount earned in one week would be guaranteed income for 1 week plus 20% of t:

300+0.20t

Therefore, our required function is f(t)=300+0.20t and option D is the correct choice.

7 0
3 years ago
De las soluciones de la siguiente ecuación: x2 + 8x − 30 = 18? Cual es el numero de mayor valor Entre.
vekshin1

Answer:

The correct answer is "x = 4" and "x = -12".

Step-by-step explanation:

The given equation is:

⇒  x^2+8x-30=18

On subtracting "18" from both sides, we get

⇒  x^2+8x-30-18=18-18

⇒  x^2+8x-48=0

On applying factorization, we get

⇒  x^2+12x-4x-48=0

On taking common, we get

⇒  x(x+12)-4(x+12)=0  

⇒  (x-4)(x+12)=0

⇒                 x-4=0

                          x=4

or,

⇒               x+12=0

                         x=-12    

4 0
3 years ago
Min's hose can pump 21 gallons of water every hour. How many gallons of water will he fill up if he runs the hose for 2/3 of an
geniusboy [140]

Answer:

14

Step-by-step explanation:

21 divided by 3 =7   7 per 1/3

7x2=14

8 0
3 years ago
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