4x+3y = 21 2x+ y= help stuck

Answers

Answer 1

Answer: If x and y were equal then you would do 21/7 and that is 3 so x=3 and y=3 so if you do the second one then 6+3=9. So the answer is 9

Answer 2

Answer: This answer is done through substitution.
Use 2x+y = 0
y = -2x
Now, use this y value and substitute in the 1st equation
4x + 3 (-2x) = 21
4x + -6x = 21
-2x = 21
x = - 21/2
x= -10.5
Now, use this value into 1st equation again to find y
4(-10.5) + 3y = 21
-42 + 3y = 21
3y = 21 + 42
3y = 63
y=63/3
y=21
Use this and the value of X we got above to substitute in the 2nd equation.
2 (-10.5) + 21
=-21 + 21 = 0
The answer is zero.

If you want to keep the fraction and not use a decimal, you can do so from the previous steps. Still you will get the same answer.

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Which statement is not always true about irrational numbers

Answers

"Irrational numbers start with 37.2 ."

If this is not one of the statements on the list of choices that comes
with this question, then perhaps you could let us see the list of choices
that comes with this question, so that we can guide you to the best choice.

Answer:

here are the statements I need help on this too help for iready!!!

1. 360 miles in 6 hours

Answers

Answer:

60mph

Step-by-step explanation:

a man invested a total of $3,000 in two investments. he made a profit of 3% on the first investment and 4% on the second investment. if his total profit was $107, what was the amount of each investment?

Answers

Let the amount that the man placed in the first investment be $x$ . Then, the amount that he placed in the second investment has to be $\$3000 - x$ . Using those as the investment amounts, the total profit is given by adding the two separate profits as shown:

$.03x + .04(\$3000 - x) = \$107$

We can now solve for x:

$.03x + .04(\$3000 - x) = \$107$
$.03x + (\$120 - .04x) = \$107$
$\$120 - .01x = \$107$
$.01x = \$13$
$x = \$1300$

Thus,

First investment: $x = \bf \$1300$
Second investment: $\$3000 - x = \$3000 - \$1300 = \bf \$1700$

Find a number between 364 and 384 that is both a multiple of 7 and a multiple of 3

Answers

So the least common multiple of 7 and 3 is 21

So the multiple between 364 and 384 should be a multiple of 21.
21 × 18 = 378
And the number that is between 364 and 384 and is a multiple of 7 and 3 is 378

A case of Mountain Dew (24cans) costs $7.68. What is the unit price?

Answers

Here are the unit rates involved:

$7.68 / 1 case = $7.68 per case

$7.68 / 24 cans = $0.32 per can

1 case / $7.68 = 0.13 case per $

24 cans / $7.68 = 3.125 cans per $

And of course ...

24 cans / 1 case = 24 cans per case

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Which inequality matches the graph? (2 points)A) −2x + 3y > 7

B) 2x − 3y < 7

C) −3x + 2y > 7

D) 3x − 2y < 7

Answers

Answer:

D) 3x − 2y < 7

Step-by-step explanation:

We note that the x- and y-intercepts are about 2.3 and -3.5, respectively.

In "intercept form," the equation of the line can be written ...

x/x-intercept +y/y-intercept = 1

Using the given intercepts, this is ...

x/2.3 +y/(-3.5) = 1

The answer choices suggest that we should multiply this by 7. When we do, we get ...

3x -2y = 7 . . . . the equation of the boundary line

The next trick is to figure the comparison symbol. We note that x-values are less than those on the line, and y-values are greater than those on the line. It is convenient to consider the term with a positive coefficient, so we don't get confused with minus signs and reversed comparisons.

As we said, x-values are less than those on the line, so the shaded area is ...

3x -2y < 7 . . . . matches choice D

Answer:

D) 3x − 2y < 7

Step-by-step explanation:

Took the test and got it right :)

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