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stepan [7]
3 years ago
13

Solve the equations 7x+9y=27 and 4x+5y=13 by combining the equations

Mathematics
1 answer:
Fantom [35]3 years ago
7 0
Is that what you need

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Write your own two equations that would have a solution of (3, 6).
andrey2020 [161]

Answer:

y = 2x

y = 3x - 3

Step-by-step explanation:

Hi,

<u>y = 2x</u>

<u>6 = 2(3)</u>

<u>6 = 6</u>

<u>That's a solution</u>

<u>y = 3x - 3</u>

<u>6 = 3(3) - 3</u>

<u>6 = 9 - 3</u>

<u>6 = 6</u>

<u>That's a solution</u>

Hope this helps :)

8 0
3 years ago
Find the function values
babymother [125]

Step-by-step explanation:

f(x)=3x−2  so when the variable x is replace with an actual value ( − 1 ) we get  f(−1)=3(−1)−2

=−3−2

=−5

4 0
2 years ago
La funcion que representa el beneficio obtenido por una empresa si vende x unidades de uno de sus productos es f(x)= -70x^2+2800
DerKrebs [107]

Answer:

20

Step-by-step explanation:

La función es

f(x)=-70x^2+2800x-45000

Diferenciando con respecto a x obtenemos

f'(x)=-140x+2800

Igualar con cero

0=-140x+2800\\\Rightarrow x=\dfrac{2800}{140}\\\Rightarrow x=20

Doble derivada de la función

f''(x)=-140

Entonces, la función es máxima cuando el número de unidades vendidas,  x=20,

3 0
3 years ago
Mateo puts 6 gallons of gas in his ca and pays $15.<br><br>What is the cost of 1 gallon?
sweet [91]

Answer: 1 gallon costs 0.40 $

Step-by-step explanation: 6 gallons / 15$ = 0.4 gal/$

3 0
3 years ago
Solving systems of equations with substitution:<br> y= 2x-4 <br>y= -x+5<br><br>help please!
Furkat [3]
<span>y= 2x-4 
y= -x+5
so

</span><span>2x-4 = -x+5
2x +x = 5 +4
3x = 9
x =3

y = 2x-4
y =2(3) - 4
y = 6-4
y = 2

answer: (3,2)</span>
4 0
3 years ago
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