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3 years ago

Solve the system of equations and choose the correct ordered pair. 3x + 4y = 38 5x - 5y = -30

1 answer:

3 0

3x + 4y = 38 ( equation 1) ----> ×5 5x - 5y = -30 ( equation 2) ----> ×3 When you multiply eqn 1 by 5 you get, 15x + 20y = 190 And when you multiply eqn 2 by 3, you get, 15x - 15y = -90 Then you solve both equations by subtracting eqn 2 from eqn 1 15x + 20y = 190 15x - 15y = 90 Then 15x - 15x gets cancelled and 20y - (-15y) gives 35y and 190 - (-90) gives 280. So that gives 35y = 280 y = 8 And when you replace y = 8 in any of the two equations, x = 2

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Incorrect 00:00 Evaluate the expression for x = 1.7. Enter your answer in the box. х2 + 3x

IrinaK [193]

Answer:

7.99

Step-by-step explanation:

x^2 +3x

Let x=1.7

(1.7)^2 +3(1.7)

2.89+5.1

7.99

5 0

3 years ago

Solving Rational equations. LCD method. Show work. Image attached.

Ugo [173]

Answer:

$k=\frac{1}{2}$

Step-by-step explanation:

The given rational equation is

$\frac{5k}{k+2}+\frac{2}{k}=5$

The Least Common Denominator is

$k(k+2)$

Multiply each term by the LCD.

$k(k+2)\times \frac{5k}{k+2}+k(k+2)\times \frac{2}{k}=5k(k+2)$

Simplify;

$k\times \frac{5k}{1}+(k+2)\times \frac{2}{1}=5k(k+2)$

$\Rightarrow k(5k)+2(k+2)=5k(k+2)$

Expand;

$\Rightarrow 5k^2+2k+4=5k^2+10k$

Group similar terms;

$\Rightarrow 5k^2-5k^2+2k-10k=-4$

$\Rightarrow -8k=-4$

Divide by -8.

$k=\frac{1}{2}$

5 0

3 years ago

Find 4,5,6 Answer the rest for a thank you, and a brainliest.

zmey [24]

Area of circle= $\pi r^{2}$

Q4. Area of circle= $\pi *12^{2}$
=3.14* $12^{2}$
=452.16 $in^{2}$

Q5. Area of circle= $\pi * ( \frac{6}{2} )^{2}$
=3.14* $3^{2}$
=28.26 $in^{2}$

Q6. Area of circle= $\pi * (3 \frac{1}{2} )^{2}$
= $\frac{22}{7} * ( \frac{7}{2} )^{2}$
=38.5 $in^{2}$

4 0

3 years ago

Read 2 more answers

2. Which of the following ordered pairs (x,y) satisfies the system of equations below?

bixtya [17]

Answer:

b(2,-2)

Step-by-step explanation:

x= 2 and y=-2

let me know if you want further eplanation

3 0

3 years ago

I next help on the polynomial

slamgirl [31]

Answer:

u just have to cross multiply im pretty sure thats how my math teacher show me,

Step-by-step explanation:

first you take the one x over to the other x and that will make it 2x then do the same thing with -10 u do -10 times 10 and then u get -100 and then the answer is 2x-100 and depending on your teach if he/she wants you to stop their then u can but if u have to got further then u would divide 2 on both sides and then that would be 0.02

this is how my teacher showed us how to do it and i hope this helps you a lot and if it dont im sorry i tried for you!!!

have a nice day Hun

8 0

4 years ago