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2 years ago

X-TRA POINTS! X-MAS CELEBRATION! POINTS FOR ONE EASY QUESTION!

Mathematics

2 answers:

aleksandrvk [35]2 years ago

7 0

Answer:

2x-1=y,2y+3=x

Step-by-step explanation:

Hope this helps ( Thanks!!! ) :D

KiRa [710]2 years ago

5 0

Answer:

x=-1/3 and y=-5/3

Step-by-step explanation:

Solve 2x−1=y for y:

2x−1=y

2x−1+−y=y+−y(Add -y to both sides)

2x−y−1=0

2x−y−1+−2x=0+−2x(Add -2x to both sides)

−y−1=−2x

−y−1+1=−2x+1(Add 1 to both sides)

−y=−2x+1

-y/-1 =-2x+1/-1 (Divide both sides by -1)

y=2x−1

Substitute 2x−1 for y in 2y+3=x:

2y+3=x

2(2x−1)+3=x

4x+1=x(Simplify both sides of the equation)

4x+1+−x=x+−x(Add -x to both sides)

3x+1=0

3x+1+−1=0+−1(Add -1 to both sides)

3x=−1

3x/3=-1/3

x=-1/3

Substitute -1/3 for x in y=2x−1:

y=2x−1

y=2(-1/3)-1

y=-5/3 (Simplify both sides of the equation)

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3. Sam and Tim each have savings accounts. Every month they each put in some of their

Setler [38]

Answer:

$y = 30x +50$ --- Sam

$y = 20x +80$ --- Tim

Step-by-step explanation:

Given

Sam Tim

х --- f(x) --------------- g(x)

1 --- 80 --------------- 100

2 --- 110 --------------- 120

3 --- 140 --------------- 140

4 --- 170 -------------- 160

Required

Determine the y value

y value implies the equation of the table

Calculating the equation of Sam

First, we need to take any corresponding values of x and y

$(x_1,y_1) = (1,80)$

$(x_2,y_2) = (4,170)$

Next, we calculate the slope (m)

$m = \frac{y_2 - y_1}{x_2 - x_1}$

$m = \frac{170 - 80}{4 - 1}$

$m = \frac{90}{3}$

$m = 30$

Next, we calculate the line equation using:

$y - y_1=m(x-x_1)$

$y - 80 = 30(x - 1)$

$y - 80 = 30x - 30$

Make y the subject

$y = 30x - 30 + 80$

$y = 30x +50$

Calculating the equation of Tim

First, we need to take any corresponding values of x and y

$(x_1,y_1) = (1,100)$

$(x_2,y_2) = (4,160)$

Next, we calculate the slope (m)

$m = \frac{y_2 - y_1}{x_2 - x_1}$

$m = \frac{160 - 100}{4 - 1}$

$m = \frac{60}{3}$

$m = 20$

Next, we calculate the line equation using:

$y - y_1=m(x-x_1)$

$y - 100 = 20(x - 1)$

$y - 100 = 20x - 20$

Make y the subject

$y = 20x - 20+100$

$y = 20x +80$

7 0

3 years ago

A stock lost 8 1/4 points on Monday and then another 2 3/4 points on Tuesday. On Wednesday, it gained 12 points. What was the ne

VARVARA [1.3K]

There was a net gain of 1.

Hope I could help!

6 0

3 years ago

Read 2 more answers

The length of a rectangle is 4 yd more than twice the width x. The area is 390

masya89 [10]

Step-by-step explanation:

step 1. let l be the length of the rectangle

step 2. l = 2x + 4

step 3. lx = 390 yd^2

step 4. (2x + 4)x = 390

step 5. 2x^2 +4x = 390

step 6. 2x^2 + 4x - 390 = 0

step 7. -4 +- sqr(4^2 -4(2)(-390))/2(2) quadratic formula

step 8. (-4 +- sqr(3136))/4

step 9. (-4 +- 56)/4

step 10. x = 13yd, l = 2x + 4 = 2(13) + 4 = 30yd.

3 0

3 years ago

A triangle has interior angles equal to 55, 70 and x. What is the value of X?

podryga [215]

The answer is C. 55

You get your answer by adding together the degrees of the angles you know 55+70

That equals 125 degrees and subtract that from 180 degrees

180-125= 55

8 0

3 years ago

Create polynomial functions using the given information:

ycow [4]

It's pretty much simple. Since we can factor a polynomial by its zeros, lets write one of degree nine :

X(X-1)(X-2)(X-3)(X-4)(X-5)(X+1)(X+2)(X+3)= X^9-9X^8+6X^7+126X^6-231X^5-441X^4+944X^3+324X^2-720X

This polynomial is of degree 9 and has exactly 5 strictly positive zeros : 1, 2, 3, 4, 5

And it has 3 negative zeros : - 1, -1, - 3

And it has 0 as a zero too.

There is also this one :

(X-1)(X-2)(X-3)(X-4)(X²+1)(X+1)(X+2)(X+3) = X^9-4X^8-13X^7+52X^6+35X^5-140X^4+13X^3-52X^2-36X+144

It has 4 positive zeros : 1, 2, 3, 4.

It has complex zeros : i and - i

3 negative zeros : - 1, - 2 , - 3

Good Luck

8 0

2 years ago