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Sindrei [870]
3 years ago
10

Please help Explanation will be appreciated thanks,

Mathematics
1 answer:
Genrish500 [490]3 years ago
4 0

Answer: A; 6.3%

Step-by-step explanation:

Problem 1

For the first problem, we first want to find y so that we can plug it into the expression.

We can use elimination method for the system of equations to solve.

3x+3y=21

3x-y=5

We subtract both equations to eliminate x.

4y=16                                        [divide both sides by 4]

y=4

Now that we know y, we can plug it into the expression.

\frac{4}{2} -3                                         [divide]

2-3                                         [subtract]

-1

We know that the answer is A.

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

Problem 2

For the second problem, we need to know how to calculate percent error. The formula for precent error is \frac{|measured-exact|}{exact} *100%. We know that the exact value is 80 because the buyer was supposed to given 80. 75 is the measured value because that was what the buyer was given.

\frac{|75-80|}{80} *100%                               [subtract]

\frac{|-5|}{80} *100%                                   [solve absolue value]

\frac{5}{80} *100%                                     [divide]

0.0625*100%                               [multiply]

6.25

Since the problem said to round to one decimal place, we know that the answer is 6.3%.

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3 years ago
Write, in slope intercept form, the equation of the line that passes through (8, -9) and has a slope of -5/4.
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Answer:

The equation in the slope-intercept form will be:

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Step-by-step explanation:

Given

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As we know that the equation of a line in point-slope form is

y-y_1=m\left(x-x_1\right)

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y-\left(-9\right)=\frac{-5}{4}\left(x-8\right)

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Writing the equation in slope-intercept form

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so the equation of the line in slope-intercept form becomes

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subtract 9 from both sides

y+9-9=\frac{-5}{4}\left(x-8\right)-9

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Therefore, the equation in the slope-intercept form will be:

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7 0
3 years ago
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So two equivalent fractions for 4/12 would be 2/6 and 1/3.

4 0
3 years ago
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