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Advocard [28]
3 years ago
7

Which expression can you substitute in the indicated equation to solve the system of equations below?

Mathematics
1 answer:
Mama L [17]3 years ago
4 0

You can see almost immediately that the second equation, 3x + y = -2, can be solved for y: y = -3x - 2. (Answer A). This -3x - 2 can in turn be subbed for y in the first equation, 4x + 3y = 4. Doing so, we get 4x + 3(-3x - 2) = 4.

Carrying out the indicated opeations: 4x - 9x - 6 = 4, or -5x = 10. Thus,

x = -2. Find y using y = -3x - 2 (from above): y = -3(-2) - 2 = 4.

Thus, the solution is (-2,4). We were not asked to solve this system of equations, but doing so illustrates the helpfulness of elimination of variables in solving simultaneous equations.

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g The bursar a conducts a test of hypothesis that the mean amount of student debt a WCU undergrad will leave college with is equ
aleksandrvk [35]

Answer: Type I error

Step-by-step explanation:

A type 1 error is also referred to as the false positive and it is when a true null hypothesis is incorrectly rejected by the researcher.

On the other hand, type II error which is also refered to as the false-negative is when a null hypothesis which is false is failed to be rejected by the researcher but rather accepted.

Based on the information given in the question, since the data leads to the rejection of the null hypothesis such was later found out to be true, then a type I error has occured.

4 0
3 years ago
How to do 3/4.5-3/8.0
svet-max [94.6K]

7/24 I hope this helps you

7 0
3 years ago
Determine the quotient: (22.8 × 10–3) ÷ (5.7 × 10–6)
lana66690 [7]

Answer:

0.399

Step-by-step explanation:

The key to doing this problem properly lies in knowing and following order of operations rules.

Here we must perform mult. and div.  before  addition and subtr., but even before that we must do all work enclosed in parentheses first.

(22.8 × 10–3) is evaluated by doing the mult. first, and then subtracting 3:

(228-3) = 225

and

(5.7 × 10–6) is evaluated by doing the mult. first, then subtracting 6:

(570-6) = 564.

Finally, we divide 225 by 564, obtaining 0.399 (after rounding off to three decimal places).


8 0
3 years ago
In the picture below the right triangle is drawn with a 40° angle. For right triangles with an angle of 40", the ratio of the si
diamong [38]

Answer:

90 degrees.

Step-by-step explanation:

Considering a 40 degree angle is opposite to a 40 unit side, a 90 degree angle will be opposite to a 90 degree side.

8 0
3 years ago
Oliver earns $9 per hour. Write and solve equation to find how many hours he mustwork to earn in your equation. $315. to define
Paladinen [302]
H=hours

9h= 315

H= 315/9

H= 35

Oliver must work 35 hours to earn $315.

Hopefully, this helps!
8 0
4 years ago
Read 2 more answers
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