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Stells [14]
3 years ago
10

Complete the point-slope equation of the line through (-5,4) and (1,6). Use exact numbers.

Mathematics
1 answer:
BigorU [14]3 years ago
7 0

ANSWER

y - 6 =  \frac{2}{7} (x - 1)

EXPLANATION

The point-slope equation of a straight line is given by:

y-y_1=m(x-x_1)

Where m is the slope.

The line goes through (-5,4) and (1,6).

The slope of this line is,

m =  \frac{6 - 4}{1 -  - 6}

m =  \frac{2}{7}

The point-slope equation is

y  - 6 =  \frac{2}{7} (x - 1)

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The chemistry class was making 300 gallons of 30% isopropyl alcohol. They mixed 12% with 42%. How much of each did they use?
alexgriva [62]

Answer:

<u>The chemistry class mixed 120 gallons of 12% isopropyl alcohol and 180 gallons of 42% isopropyl alcohol.</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Amount of isopropyl alcohol made by the chemistry class = 300 of 30%

Amount of 12% isopropyl alcohol mixed by the chemistry class = x

Amount of 42% isopropyl alcohol mixed by the chemistry class = 300 - x

2. How much of each did they use?

Let's write our equation to solve for x, this way:

30% = 0.3, 12% = 0.12, 42% = 0.42

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12x + 126 - 0.42x = 90

-0.3x = 90 - 126

-0.3x = -36

x = -36/-0.3

<u>x = 120 ⇒ 300 - x = 180</u>

<u>Let's prove x = 120 is correct</u>

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12 * 120 + 0.42 (300 - 120) = 0.3 * 300

14.4 + 75.6 = 90

90 = 90

<u>We proved x = 120 is correct</u>

5 0
3 years ago
Solve: 3/5y + 3 = 11 + 1/5y
ale4655 [162]

Answer:

Y=20

Step-by-step explanation:

y equals 20 because you simplify both sides of the equation then you have an isolated variable

7 0
3 years ago
Read 2 more answers
4/7 is the result when 1/2 and x are added.
kipiarov [429]
By solving the equation
1/2 +x =4/7
x = 4/7 -1/2
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3 years ago
Write the equation of this graph in slope- intercept form<br>0,6 4,0​
zloy xaker [14]

Answer:

4 x − 5 + y = 0

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Step-by-step explanation:

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3 years ago
Which of the following is equivalent to (-2/3) with a exponent of 3
Zinaida [17]

Answer:

( -8,27) I believe

Step-by-step explanation:

Because you times 2x2x2=8 and 3x3x3=27. Getting( -8,27)

Hope this helps :)

4 0
3 years ago
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