What is the solution of the system of equations?
y = –2x + 8
y = x – 4

Answers

Answer 1

Answer: y = –2x + 8
y = x – 4

Set them to equal to each other to solve for x.

x - 4 = -2x + 8

3x = 12

x = 4

Plug 4 for x in either equation.

y = x – 4

y = 4 - 4

y = 0

So (4, 0)

Answer 2

Answer: you could treat it as a matrix and solve it that way
graph and find intersection
etc.

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Someone please help me with number 7) I have a test Tommorow

Answers

I hope this helps you

The first four terms of a sequence are shown below:9, 5, 1, −3

Which of the following functions best defines this sequence? (5 points)

A f(1) = 9, f(n + 1) = f(n) − 4; for n ≥ 1
B f(1) = 9, f(n + 1) = f(n) + 4; for n ≥ 1
C f(1) = 9, f(n + 1) = f(n) − 5; for n ≥ 1
D f(1) = 9, f(n + 1) = f(n) + 5; for n ≥ 1

Answers

Answer:

Option A is correct.

Step-by-step explanation:

We have been given the sequence:

9,5,1,-3

We can clearly see that the next digit is four less than the previous digit.

Here first term that is a=9

So, the function would be:

$f(1)=9; f(n+1)=f(n)-4\text{for}n\geq1$

Therefore. option A is correct.

Option B and D are not correct because function is decreasing not increasing.

Option C is not correct because decreasing by 4 not 5.

Answer:

A f(1) = 9, f(n + 1) = f(n) − 4; for n ≥ 1

Step-by-step explanation:

i took the test and got it right

Kim works as a salesperson for a photo studio. To find her earnings for the week, she multiples his total sales by 0.175. Her sales for the week of October 10 total $2,507.47. What did she earn for the week? (Round your answer to the nearest cent.)A. $438.81
B. $449.83
C. $880.60
D. $388.06

Answers

To get the earning for the week you have to do this:
0.175 * the total sales

The total sales are: $2,507.47

So no multiply:
0.175 * 2,507.47 = 438.80725

Now, round it to the nearest hundredth to get your answer:
$438.81 ( A )

Which number in the monomial 215x18y3z21 needs to be changed to make it a perfect cube?3
18
21
215

Answers

remember
xyz=(x)(y)(z)
if x and y and z are all perfect cubes, xyz is also a perfect cube

remmeber
(x^n)^m=x^(mn)
so if it is perfect cube it can be factored into
(x^n)^3, such taht n is a whole number
basiclaly, see if the expoent is divisble by 3

all of them should be perfect cubes

215x^18y^3z^21

split them up to see which ones need changing

215=5*43, not a perfect cube
could be changed to 6^3, which is 216

x^18=(x^6)^3

y^3=y^3
z^21=(z^7)^3

the 215 needs to be changed

Answer: E2020 = 215

Step-by-step explanation:

Is the number 0.777777... a rational number even though it goes on and on?