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2 years ago

Please help with this Algebra 1 math problem:

2 answers:

7 0

3x - y = 2

x + y = 6

This system is already in a nice form to do the elimination method on the y variable.

We simply add vertically.

4x = 8.

x = 2. The x-coordinate of the solution is 2.

We can plug the value in to find y if needed.

2 + y = 6.

y = 4.

Ksenya-84 [330]2 years ago

3 0

2................................................................

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20:45 or 4:9 if simplified

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2 years ago

Choose the ordered pair that is a solution to the system of equations. 3x - y = 9 2x + y = 6

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2 years ago

∠A∠A and ∠B∠B are vertical angles with m∠A=xm∠A=x and m∠B=5x−80m∠B=5x−80 . What is m∠Am∠A ?

iris [78.8K]

The Vertical Angles Theorem states that if two angles are vertical angles, then they are congruent .Given <A and <B are vertical angles so they are equal.

<A=<B.

Measure of <A=x and <B=5x-80

Or 5x-80=x

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8 0

2 years ago

Read 2 more answers

A basketball hoop has a circumference of 144 cm.what is its diameter

levacccp [35]

$Formula\ for\ circumference \ of\ circle:\ \ \ 2 \pi r\\\\
144= 2 \pi r\ \ \ \ | divide\ by\ 2 \pi\\\\
r=\frac{72}{\pi}cm\\\\diameter=2radius\\\\
diameter=2r=2*\frac{72}{\pi}=\boxed{\frac{144}{\pi}}$

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2 years ago

Sample size: A researcher is trying to decide how many people to survey. Which of the following sample sizes will result in a co

oksian1 [2.3K]

Answer:

Step-by-step explanation:

Given that a researcher is trying to decide how many people to survey.

We have confidence intervals are intervals with middle value as the mean and on either side margin of error.

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Thus confidence interval width depends on margin of error.

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Thus for the same confidence level and std deviation we find margin of error is inversely proportional to square root of sample size.

Hence for small n we get wide intervals.

So if sample size = 300, the researcher will get wider confidence interval

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3 years ago