Please help!!! i’m not good at proofs

Mathematics

1 answer:

Studentka2010 [4]3 years ago

4 0

Answer:

17) b. commutative property

18) NOT SURE d. associative property

19) NOT SURE d. associative property

20) a. commutative property

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I'm trying to find out if the system have a unique solution, no solution or infinitely many solutions

kow [346]

Alright so this is what you do.
You need to isolate one variable so that it is y = or x =
Lets go with y = for the first one

-x +3y = -6
x - 3y = 6

Isolate y = by adding x for the first one and then subtracting x from the second one.
3y = -6 + x
-3y = 6 - x

You would then divide the second one by -3 and divide by 3 in the first one.

y = (-6 +x) / 3
y = (6 -x) / -3
Since this is what y = you can put them together.

-6+x) / 3 = 6-x)/-3 (I put one parenthesis for convenience)

This equation is now set and you aren't done yet.
You can take out -1 from each side. This makes it no solution since you must always multiply by -1.
(6+x) / 3 = -1( (6+x) / 3)

Try the second one on your own!

6 0

3 years ago

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Evaluate 8 − 12 ÷ 2 + 3. 1 −1 4 5

Anvisha [2.4K]

According to the order of operations, multiplication and division are performed before addition and subtraction.

... 8 - 12 ÷ 2 + 3

... = 8 - 6 + 3 . . . . . . 12÷2 = 6

... = 2 + 3 . . . . . . . . . 8-6 = 2

... = 5

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3 years ago

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What is the area of a circle with a radius of 7?

blsea [12.9K]

A = pi r^2
A = 3.14 x 7^2
A = 3.14 x 49
A = 153.86

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3 years ago

How to round to nearest hundredth

loris [4]

Answer:

just look at the decimal after the decimal number is the tenths place the hundreds place and so on if i have to round 567.1092 i would round the nine up to make the zero a one so my rounded answer would be 567.11

Step-by-step explanation:

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3 years ago

The price of a share of stock in JZMobile was $74 two weeks ago. Seven weeks ago, the price was $59 a share. Which linear equati

jok3333 [9.3K]

Given:

The price of a share of stock in JZMobile was $74 two weeks ago.

Seven weeks ago, the price was $59 a share.

To find:

The linear equation to find the price p of a share of JZMobile w weeks from now.

Solution:

Let, p be the price of a share of JZMobile w weeks from now.