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Ad libitum [116K]
3 years ago
10

Plz help ! solve the following system of equations 5x+7y=23 9x+4y=7

Mathematics
1 answer:
Agata [3.3K]3 years ago
8 0

Answer: x = -1 y = 4  I got my answer by solving for one variable in the first equation and then substituting what I got for that variable into the second equation in place of that aforementioned variable then solving for the last variable.

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Part A: The area of a square is (16x2 − 8x + 1) square units. Determine the length of each side of the square by factoring the a
d1i1m1o1n [39]

Answer:

see below

Step-by-step explanation:

16x^2 − 8x + 1

(4x)^2 -8x +1

Factor

This is a perfect square trinomial

a^2 -2ab +b^2 = (a-b)(a-b)

(4x)^2 -8x +1 = (4x-1) (4x-1)

The area of a square is given by

A = s^2

(4x-1) ^2 = s^2

4x-1 = s

The side length is 4x-1

(81x^2 − 4y^2)

(9x)^2 - (2y)^2

This is the difference of squares

a^2 - b^2 = (a-b) (a+b)

(9x-2) (9x+2)

The area of a rectangle is

A = l*w

(81x^2 − 4y^2)  = (9x-2) (9x+2)

The dimensions are (9x-2) (9x+2)

3 0
3 years ago
Is the square root of 12 rational or irrational?
Andreyy89
<h3>Answer: Irrational</h3>

We cannot write sqrt(12) as a fraction of two whole numbers

Note how sqrt(12) = 3.464 and the decimal portion goes on forever without any known pattern (and it doesnt repeat either).

Compare this to something like sqrt(16) = 4 which can be written as a fraction 4/1, so sqrt(16) is rational

5 0
3 years ago
-7 2/3 + (-5 1/2 ) + 8 3/4
Tanzania [10]

Answer:131/12

Step-by-step explanation:

-7 2/3 -5 1/2 +8 3/4 = 23/3 - 11/2 + 35/4 = 92/12 -66/12 +105/12 = 131/12

5 0
3 years ago
Simplify the expression m-6n-3/m-13n-1
rosijanka [135]

ANSWER: 7n-2

m-6n-3/m-13n-1

First you cross cancel m

then you get -6n-3/-13n-1

Thn you would subtract : 7n-2

3 0
3 years ago
Read 2 more answers
You work for a dress maker and your boss sends you to the fabric store to buy blue fabric she tells you to buy the best deal wha
PSYCHO15rus [73]
Given <span>20 yards for $30.00, unit rate = $30 / 20 yards = $1.5 per yard

Given 40 yards for $45.00, unit rate = $45 / 40 yards = $1.13 per yard

Given 50 yards for $70.00, unit rate = $70 / 50 yards = $1.4 per yard

Given 65 yards for $85.00, unit rate = $85 / 65 yards = $1.31 per yard

The best deal is the cheapest rate which is 40 yard for $45.00
</span>
4 0
3 years ago
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