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2 years ago

Please help me i need help quick

Mathematics

2 answers:

RoseWind [281]2 years ago

6 0

Answer:

x = -2

y = -6

Step-by-step explanation:

Equating the equations :

x - 4 = 4x + 2
3x = -6
x = -2

y = -2 - 4
y = -6

Mama L [17]2 years ago

3 0

y=x-4
y=4x+2

Equate both

x-4=4x+2
-4-2=4x-x
-6=3x
x=-2

And

y=-2-4=-6

Graph attached

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Which rate is the lowest price?

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The correct answer is$5.50 for 5

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I don’t understand this.. will someone please help? Will mark Brainliest along with 20 points.

inn [45]

To say two quantities $a$ and $b$ "vary directly" with one another means that a change in one of the quantities results in a proportional change in the other quantity. For example, if $a=2b$ , then $b$ is proportional to $a$ by a factor of 2, or $a$ is proportional to $b$ by a factor of 1/2. In other words, if you change $b$ by some fixed amount, then $a$ changes by double that amount.

Mathematically this means there is some constant scaling factor $k$ such that $a=kb$ . In question 4, we're told $f(x)$ varies directly with $x^2$ , which means there's some $k$ such that

$f(x)=kx^2$

We're given that $f(x)=40$ when $x=2$ , so

$40=k\cdot2^2\implies40=4k\implies k=10$

Then when $x=5$ , we get

$f(5)=10\cdot5^2=10\cdot25=250$

- - -

For $a,b$ to "vary inversely" with one another means that a change in one quantity results in an "opposite" change in the other. In other words, if $a$ increases, then $b$ decreases, and vice versa.

Mathematically, this is the same as saying there is some fixed number $k$ such that $ab=k$ .

For example, if $k=1$ and we start with $a=1$ , then $b=1$ also. If we change to $a=2$ , then $b=\dfrac12$ ; if $a=10$ , then $b=\dfrac1{10}$ , and so on.

In question 5, we're told $f(x)$ varies inversely with $x$ , so that there is some constant $k$ for which

$x\,f(x)=k$

When $x=4$ , we have $f(x)=6$ :

$4\cdot6=k\implies k=24$

Then for $x=8$ , we get

$8\,f(8)=24\implies f(8)=3$

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3 years ago

Pls answer this along with ur method

Lesechka [4]

Y = 2

y/4 + 2/3 = y/3 + 1/2

2/4 = 1/2
2/3 = 2/3

2/4 + 2/3 = 2/3 + 1/2

3 0

4 years ago

Can someone help me please

Vesna [10]

Answer:

#5) Its line “k”

Well to solve this you need to know what negative slopes are.

They decrease from height from left to right

And also a slope is always calculated like this

rise -> run

Think of it like a bed.

You have to wake up which means you have to rise and then you run to do whatever it is you gotta do.

Rise is going vertical and run is going horizontal.

So for line K you have it because since its negative its -3/1 so technically its -3 rise(basically fall since its negative), 1 run (right).

#6) 1/2 is the slope of line N. Or (c)

Well n is a potsive slope so we can automatically remove a and b.

And we can count like this, it started from the orgin it looks like (but you can use any given point really) and then just follow it, rise 1 and run 2. Rise 2 and run 3 doesn’t work so it has to be 1.2 or (c)

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3 years ago