Dimitri determined that the ordered pair (2, –2) is a solution to the system of linear equations 7x + 9y = –4 and 5x – 2y = 6 as shown.He mixed up the coordinates of the ordered pair when substituting it into the equations 7x + 9y = –4 and 5x – 2y = 6.

He checked the equation 7x + 9y = –4 first when he should have checked first.

He made a mistake in his calculations when substituting the ordered pair into the equation 7x + 9y = –4 and simplifying.

He made a mistake in his calculations when substituting the ordered pair into the equation 5x – 2y = 6 and simplifying.

Answers

Answer 1

Answer:

Answer: D. He made a mistake in his calculations when substituting the ordered pair into the equation 5x -2y =6 and simplifying.

Step-by-step explanation: I got the answer correct on a test. Hope this helps!

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-graph B
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Answers

basically, the closer they fit to the imaginary line of best fit, the higher they are

the closer the dots are to the imaginary line, te higher the number

D looks the closest together so that is first
A is a little farther apart
C is farther
B is farthers

DACB is order

Answer:

D,A,C,B

Step-by-step explanation:

George found that he blinked 85 times in 15 minutes. at this rate, how many seconds passed during 51 blinks

Answers

540 seconds, because this is just a proportion. You find the number of seconds in 15 mins, which is 900 seconds, then you do 85 blinks/900 seconds = 51 blinks/? seconds. You cross multiply and get 45,900=85x. You divide each by 85 to get x=540.

1 min = 60 seconds, so
15 min = 15 x 60 seconds = 900 seconds
85 blinks in 900 seconds
900/85 = 10.58 seconds per one blink (this number is rounded, but final answer is exact)
10.58 x 51 = 540 seconds for 51 blinks

Four less than the product of a number and 7 is eight more than that number

Answers

Let the number be x, then 7x - 4 = x + 8
7x - x = 8 + 4
6x = 12
x = 12/6 = 2.

Therefore, the number is 2.

Why the order of a succession is important

Answers

Answer:

Step-by-step explanation:

The order of a succession is a way that the terms (the first, the second, the third, etc.) can be distinguished according to a certain formation law or order criterion.

Example:

a¹/a²/a³/a⁴ And successively

In the order of a sequence you can assign any letter.

Find dy/dx
2x+3y=sinx

Answers

$2x+3y=sinx\n\n3y=sinx-2x\ \ \ \ /:3\n\ny=(1)/(3)(sinx-2x)\n\n(\delta y)/(\delta x)=\left[(1)/(3)(sinx-2x)\right]'=(1)/(3)\left[(sinx)'-(2x)'\right]=(1)/(3)(cosx-2)$

Solve the system of equations 3y+2z=12 and y-z=9

Answers

mulitply second equation by 2 and add to first

3y+2z=12
2y-2z=18 +
5y+0z=30

5y=30
divide 5
y=6

sub back
y-z=9
6-z=9
minus 6
-z=3
times -1
z=--3

x=-3
y=6

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(sin teta + sec teta)^ + (cos teta+ cosec teta )^ = (1 + sec x cosec)^