How to solve x + 2y = 134x + 8y = −9
I get confused after eliminating the x.
Please help?

Answers

Answer 1

Answer: You need to multiply x + 2y = 13 by -4 then the -4 and +4 will cancel each other out then you solve the rest of the equation.

Answer 2

Answer: y= zero

using the process of substitution I had this...

4( -2y +13) +8y = -9
distribution -8y +52 -8y= -9

so -8y+8y =0
you end up having zero for y no matter what the subtraction of 52 was, because anything divided by zero is zero...

so if you already have the x value, your point is going to be an x-intercept

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Find the percent of decrease from 22 songs to 12 songs. Round to the nearest tenth of a percent if necessary.percent of decrease %

Answers

Answer:45.5% decrease????

Step-by-step explanation:

Solve the equation 4x^2-17x-15=0

Answers

$4x^2-17x-15=0\n 4x^2-20x+3x-15=0\n 4x(x-5)+3(x-5)=0\n (4x+3)(x-5)=0\n x=-(3)/(4) \vee x=5$

4x^2 - 17x - 15 = 0
(4x + 3)(x-5)
4x + 3 = 0
4x = -3
x = -3/4

x - 5 = 0
x = 5

What is the slope of the line y = 2x + 1 ?

Answers

y = 2x + 1

The slope of the line y is 2.

In the formula: y = mx + b

m is the slope while b is the y-intercept. Since 2 is the number that is in the place of m, it is the slope of the line while 1 is the y-intercept.

y=mx+b

M is the slope, and B is the Y-intercept.

y=2x+b

In this case, 2 is m.

The slope is 2/1, or 2.

I hope I helped! :)

Purchase computer of 30000

Answers

Answer:

particular debit credit

Purchase A/C Dr 30000

To cash A/C 30000

An inlet pipe on a swimming pool can be used to fill the pool in 40 hours. The drain pipe can be used to empty the pool in 45 hours. If the pool is 14 filled and then the inlet pipe and drain pipe are opened, how many more hours would it take to fill the pool? Round your answer to two decimal places, if needed.

Answers

Answer:

It would take 90 hours to fill the pool.

Step-by-step explanation:

There is a mistake in the question so it is corrected below:

An inlet pipe on a swimming pool can be used to fill the pool in 40 hours. The drain pipe can be used to empty the pool in 45 hours. If the pool is 1/4 filled and then the inlet pipe and drain pipe are opened, how many more hours would it take to fill the pool?

Now, to find the hours would it take to fill the 1/4 pool.

Let the hours it take to fill the $(1)/(4)$ pool be $h.$

A swimming pool can be used to fill the pool in 40 hours.

So, the rate of filling the pool = $(1)/(40)$ .

As, given the drain pipe can be used to empty the pool in 45 hours.

Thus, the rate of draining the pool = $(1)/(45)$ .

According to question:

$(1)/(40) -(1)/(45) =((1)/(4))/(h)$

$(1)/(40) -(1)/(45) =(1)/(4h)$

$(45-40)/(1800) =(1)/(4h)$

$(5)/(1800) =(1)/(4h)$

Using cross multiplication:

$20h=1800$

Dividing both sides by 20 we get:

$h=90\ hours.$

Therefore, it would take 90 hours to fill the pool.

2x+y=15
y=3x
I think it's substitution

Answers

$\left\{\begin{array}{ccc}2x+y=15\ny=3x\end{array}\right\n\nsubtitute:\n\n2x+3x=15\n5x=15\ \ \ \ |divide\ both\ sides\ by\ 5\n\boxed{x=3}\n\nsubtitute\ value\ of\$