Uhhh this is so fustrating but someone please help

Answers

Answer 1

Answer: x is 3 times the value of y, then x=3y;
y is 10 more than twice the value of X, then y= 10+2x.
{x=3y
{y=10+2x
Solve the system substituting the value of x in y:
{x=3y
{y=10+2(3y)

{x=3y
{y=10+6y

{x=3y
{y=-2

Now substitute the y to find x:

{x=3(-2)=-6
{y=-2

Related Questions

What's 3 17/100 as a decimal
Cocoa plant type 1 yielded 155 bushels per acre last year at a research farm. This year,cocoa plant type 2, planted in the same location, yielded only 123 bushels per acre andthere was a major freeze. The researchers do not know whether the difference is theresult of the superiority of type 1 or the freeze. What is this an example of? (4 points)- Bias- Confounding variable- Matched-pairs desighs- The placebo effect- Replication
Is each equation equivalent to y=-1/2x+3
Help!!!!!!whats this answer guys?
Find the factors of 42 show and explain your work and list the factor pairs in a table

2x +3y =12 Dan 3x-1y=7

Answers

2x+3y=12
3x-y=7

use subsituttion
make one of the equations equal to a placeholder
3x-y=7
subtract 7
3x-7-y=0
add y
3x-7=y
subsisute 3x-7 for y in first equation

2x+3(3x-7)=12
2x+9x-21=12
11x-21=12
add 21 to both sides
11x=33
divide both sides by 11
x=3

subsitute x for 3 in any equation
3x-7=y
3(3)-7=y
9-7=
2=y

x=3
y=2

2x+3y=12
3y=-2x+12
y=-2x/3+4

3x-1y=7
-1y=-3x+7
y=3x-7

Isabella spent $49 for 7 bracelets. Each bracelet cost the same amount. How much did each bracelet cost?

Answers

To answer this question, we first have to set up an equation with variables.
We can use "x" to represent the cost of each bracelet.

Equation: number of bracelets bought × cost of each bracelet = total cost

Number of bracelets bought: 7
Total Cost: 49

Using this information, we can fill in the equation and solve for x.

7x = 49

To isolate x, divide both sides by 7.

x = 7

Since x equals 7, we now know that each bracelet cost $7.

How do you model a decimal using a fraction

Answers

Okie dokie,
When converting a decimal, you use the place the decimal is in...
Let's review the places: tenths, hundredths, thousandths, etc.
You look at the last number to determine what place you're using!
-------------------
Now here's an example for the tenths place:
.5
it's in the tenths place, right? so put it over that number (with no decimal) over a 10.
(mobile) 5/10 or $(5)/(10)$
Now, decide if you can simplify. You can! 5/10 simplifies down to 1/2.
$(1)/(2)$ is your answer!
--------
Example for the hundredths place:
.26
the last number is in the hundredths place, so put the number (without a decimal) over 100!
26/100 or $(26)/(100)$
You can simplify this!
13/50 is your answer!

Calculators can also come in handy!
Good luck!

You can do 90 sit-ups in 2 minutes. Your friend can do 135 sit-ups in 3 minutes. Do these rates form a proportion? Explain.

Answers

My situps in 1 minute = 90/2 = 45

Friend sit-ups in 1 minute = 135/3 = 45

So, proportion would be 45/45 = 1.

As it is forming directly one, so we can say these rates did not form a proportion.

Please help I'm a little confused!Eight is less than or equal to the quotient of a number and negative four.

Answers

I will have "x" represent the unknown number, or you could use a "?", doesn't matter.

$8\leq (x)/(-4)$ [8 is less than or equal to (≤) the quotient (÷) of a number and -4, so the number is being divided by -4]

If you need to solve this, you need to isolate/get the variable "x" by itself in the inequality:

$8\leq (x)/(-4)$ Multiply -4 on both sides to get rid of the fraction and get "x" by itself

$(-4)8\geq (x)/(-4) (-4)$ When you multiply/divide by a negative number, you flip the sign (< >)

-32 ≥ x [-32 is greater than or equal to x, or x is less than or equal to -32]

Jenya paid $40 per month for a cell phone plus $1.25 for each international text message she sent. She sent 50 international text messages in a month. What was Jenya's total cell phone bill