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alexandr402 [8]
3 years ago
15

Solve the equation... х = Зу-7 3х +4y = 18 X= Y=

Mathematics
2 answers:
vova2212 [387]3 years ago
7 0

Answer:

x = 2, y = 3

Step-by-step explanation:

First we need to choose a variable to solve for. In this case, let's solve for y first since they give us x.

Let's plug the x into the equation.

3(3y - 7) + 4y = 18

Then let's distribute and add like terms.

9y - 21 + 4y = 18

13y - 21 = 18

Then add 21 on both sides.

13y = 39

Then divide by 13 to solve for y.

y = 3

Now that we solved for y, let's use the first equation to solve for x. You could use either one, but the top one will make it easier. Simply plug in the value of y and add like terms.

x = 3(3) - 7

x = 9 - 7

x = 2

<em>Note that if you ever feel unsure about an answer, you can simply plug the value back into the equation and check if they equal each other.</em>

dem82 [27]3 years ago
5 0
X = 2 Y = 3

(2) = 3(3) - 7

2 = 9 - 7

2 =2

3(2) + 4(3) = 18

6 + 12 = 18

18 = 18
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la componente "cubica" será aquella que tenga un exponente igual a 3.

<h3>¿como identifico una X Cubica en un polinomio?</h3>

Un polinomio tiene la forma general:

p(x) = a_n*x^n + ... + a_1*x^1 + a_0

Donde todos los exponentes de x son numeros naturales.

Particularmente, la componente "cubica" será aquella que tenga un exponente igual a 3.

Entonces, por ejemplo, en:

p(x) = 4*x^5 + 2*x^4 + 5*x^3

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8 0
2 years ago
-9(6+u)-2u= -10 HELPPPP
Fed [463]

Answer:u= -4

Step-by-step explanation:

8 0
3 years ago
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Answer:

Step-by-step explanation:

Hello,

<em>"Ray says the third-degree polynomial has four intercepts. Kelsey argues the function can have as many as three zeros only."</em>

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6 0
3 years ago
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aliina [53]
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NikAS [45]
<h3>Answer:  20% increase</h3>

======================================================

Explanation:

A = old value = 110

B = new value = 132

C = percent change

C = 100*(B-A)/A

C = 100*(132-110)/110

C = 20%

The positive C value means we have a percent increase, which corresponds to the fact that A = 110 increases to B = 132.

The B-A = 132-110 = 22 portion up top indicates that the increase is 22 pounds, which when divided over 110, gets us 22/110 = 0.20 = 20%

---------------

Checking the answer:

20% of 110 = 0.20*110 = 22

She's able to lift 22 extra pounds on top of the 110 pounds she can handle previously, so she can now lift 110+22 = 132 pounds. The answer is confirmed.

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