(3x + 3y = -21
(x + y = -7
Need help asap

x= -8 and y= 1

Step-by-step explanation:

First, let's work on your first equation,3x+3y=-21

This means, see if it can be simplified at all before attempting to solve it.

Multiply x and 3

Multiply x and 1

The x just gets copied along.

The answer is x

x

3*x evaluates to 3x

Multiply y and 3

Multiply y and 1

The y just gets copied along.

The answer is y

y

3*y evaluates to 3y

3*x+3*y evaluates to 3x+3y

Because of the minus sign

21 becomes - 21

The answer is -21

So, all-in-all, your first equation can be written as: 3x+3y = -21

Now, let's work on your second equation,x+y=-7 x+y evaluates to x+y

Because of the minus sign

7 becomes - 7

The answer is -7

So, all-in-all, your second equation can be written as: x+y = -7

After this initial survey of the equations, the system of equations we'll set out to solve is:

3x+3y = -21 and x+y = -7

Let's start by solving 3x+3y = -21 for the variable x.

Move the 3y to the right hand side by subtracting 3y from both sides, like this:

From the left hand side:

3y - 3y = 0

The answer is 3x

From the right hand side:

The answer is -21-3y

Now, the equation reads:

3x = -21-3y

To isolate the x, we have to divide both sides of the equation by the other variables

around the x on the left side of the equation.

The last step is to divide both sides of the equation by 3 like this:

To divide x by 1

The x just gets copied along in the numerator.

The answer is x

3x ÷ 3 = x

To divide -21-3y by 3

divide each term in -21-3y by 3 term by term.

-21 ÷ 3 = -7

To divide y by 1

The y just gets copied along in the numerator.

The answer is y

-3y ÷ 3 = -y

The solution to your equation is:

x = -7-y

Next, let's solve x+y = -7 for the variable y.

Move the x to the right hand side by subtracting x from both sides, like this:

From the left hand side:

x - x = 0

The answer is y

From the right hand side:

The answer is -7-x

Now, the equation reads:

y = -7-x

To isolate the y, we have to divide both sides of the equation by the other variables

around the y on the left side of the equation.

and this is the final solution to your equation.

Now, plug the earlier result, x=-7-y, in for x everywhere it occurs in

y=-7-x.

This gives y=-7-(-7-y). Now all we have to do is solve this for y,to have our first solution.

Because of the minus sign

7 becomes - 7

The answer is -7

Because of the minus sign

7 becomes - 7

The answer is -7

-7-y evaluates to -7-y

-7 - -7 = 0

The answer is y

-7-(-7-y) evaluates to y

Move the y to the left hand side by subtracting y from both sides, like this:

From the left hand side:

y - y = 0

The answer is 0

From the right hand side:

y - y = 0

The answer is 0

Now, the equation reads:

0 = 0

To isolate the y, we have to divide both sides of the equation by the other variables

around the y on the left side of the equation.

The last step is to divide both sides of the equation by 0 like this:

Sorry, can't divide by zero! Stop! Everything below this line is wrong.

0 ÷ 0 = 1

Sorry, can't divide by zero! Stop! Everything below this line is wrong.

0 ÷ 0 = 1

The solution to your equation is:

1 = 1

Lastly, to find the solution for x, we plug this answer for y into the earlier result that

x=-7-y.

This gives x=-7-(1). Now, simplify this.

Because of the minus sign

7 becomes - 7

The answer is -7

-7-(1) evaluates to -8

x= -8

the 3rd option is right

step-by-step explanation:

the data of the detroit pistons in numerical order from least to greatest is 0.30, 0.37, 0.55, 0.62, 0.69, 0.72, 0.73, 0.75, 0.77, 0.78, 0.80, 0.81, 0.81, 0.83, 0.84, 0.89

the data of the miami heat in numerical order from least to greatest is 0.50, 0.50, 0.56, 0.57, 0.67, 0.72, 0.72, 0.72, 0.75, 0.75, 0.76, 0.81, 0.82, 0.90, 1.00, 1.00

the detroit pistons median : 1.52

the miami heat median: 1.47

the iqr of this data is 0.05