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Aleksandr [31]
2 years ago
6

Which choice is the most efficient first step to solve this set of

Mathematics
1 answer:
Lisa [10]2 years ago
4 0

Answer:

b) Substitute (3x - 5) for y in the second equation.

Step-by-step explanation:

If using the substitution method, then the second choice is the most efficient first step.

<u>What is the substitution method?</u>

The substitution method can be used to solve a system of equations. It is when you isolate any of the variables from one of the equations and then substitute that value into the other equation.

Here, the first equation already has an isolated variable, y. We can then substitute its value into the second equation. Like so:

⇒ 2x + 6y = 20

⇒ 2x + 6(3x - 5) = 20

Learn more about the substitution method here:

brainly.com/question/27728118
brainly.com/question/26094713

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A job can be done by 30 men in 15 days. How long would it take 10 men to do the same job?​
Vladimir79 [104]

Answer:

5 days

Step-by-step explanation:

This questions involves ratios, the job with 30 men can be done in 15 days, so the ratio from amount of men to amount of days the job will take to complete, it is 30:15. If we had 10 men instead of 30, 10 is one-third of 30, so you have to divide by 3 on each side of the ratio to get your answer.

If we do that we get the ratio 10:5.

Meaning that the 5 is the amount of days needed to be taken in order the complete the job.

Hope this helps!

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2 years ago
I need help please if m&lt;MNR=43 and m&lt;MNP=84 find: m&lt;RNP​ subtract or add
Zielflug [23.3K]

Answer:

  41°

Step-by-step explanation:

The angle addition theorem tells you ...

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Filling in the given values, you have ...

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Subtract 43° from both sides of the equation to find the angle of interest:

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The measure of angle RNP is 41°.

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Step-by-step explanation:

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