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Elenna [48]
3 years ago
9

X + y = 12 and y = x - 1. Find the value of 2x + 2y.

Mathematics
2 answers:
Mademuasel [1]3 years ago
5 0
Answer: 2x + 2y = 24

Explanation:

x + y = 12

2(x + y = 12)
2x + 2y = 24

So therefore, 2x + 2y = 24
Leni [432]3 years ago
3 0

Answer:

2x + 2y = 24

Step-by-step explanation:

You have to isolate <em>y</em> and then use substitution.

x + y = 12       and         y = x - 1        

-x       -x          

y = -x + 12       and         y = x - 1

-x + 12 = x - 1

+x          +x

--------------------

12 = 2x - 1

+1          +1

----------------

13 = 2x

2x = 13              [ divide both sides by 2]

x = 6.5

Now, you have to plug <em>x</em> (6.5) into <em>y = x - 1</em>.

y = x - 1

y = 6.5 - 1

y = 5.5

Finally, plug both <em>x</em> (6.5) and <em>y</em> (5.5) into <em>2x + 2y</em>.

2x + 2y

= 2 (6.5) + 2 (5.5)

= 13 + 11

= 24

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Read 2 more answers
Which of the following uses parallel construction? Select one: a. Jim likes to hunt, bike, and throwing darts. b. Mimie has to s
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Answer:

The correct answer is:

c. Joe will go running, biking and hunting

Step-by-step explanation:

Parallel construction or parallelism or parallel structure is a style used in writing a sentence, where there is a balance in phrases or clauses within one or more sentences by them having the same grammatical structure. parallelism adds elegance, clarity and symmetry to sentences. It essentially has to so with a repetition of a chosen grammatical form within a sentence.

In our example:

a.  Jim likes to hunt, bike, and throwing darts. (not parallel)

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The verbs, hunt, bike and throw must be in the same form (present continuous) to be parallel

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the sentence is not parallel because there is an inconsistency in the pattern of the construct. a parallel version is:

Jane will first throw a ball, then she will mow the lawn, or

jane will throw a ball and mow the lawn.

d. Joe will go running, biking, and hunting. (parallel)

all the verbs are in the present continuous form.

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