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adell [148]
2 years ago
9

Why does -2(x + 3y) = 18 equal y=-3-x/3? Please helppp

Mathematics
2 answers:
Citrus2011 [14]2 years ago
8 0

Step-by-step explanation:

You're asking why

{- 2(x + 3y) = 18} = y =  - 3 -  \frac{x}{3}

let's transpose the first equation for y

-2x-6y=18

-6y=18+2x

6y=-18-2x

y=-18/6-2x/6

y=-3-⅓x as required

White raven [17]2 years ago
8 0

For this I would isolate y from the beginning.

Heres how I would solve it:

-2(x + 3y) = 18 --> 18 divided by (-2) is (-9), so (x + 3y) must be equal to (-9)

x + 3y = -9 --> now I would begin to isolate for y:

3y = -9 -x

y =  (-9-x) ÷ 3 --> dividing each term by 3 would give me:

y = -3 - x/3 --> x stays the same because it doesn't have a definite answer.

Hope this helps (〃▽〃)

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35 degrees + 90 degrees + k
spayn [35]

Answer:

k would be 55

Step-by-step explanation:

35+90=125 and assuming that you're looking for a supplementary angle, the total must equal 180 so subtract 180-125  and you get k=55

5 0
3 years ago
What is the equation of the line in slope-intercept form?
lutik1710 [3]
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3 0
3 years ago
Suppose 15 quarts of a solution that is 35% antifreeze is mixed with 5 quarts of a solution that is 72% antifreeze. 1.how many q
Finger [1]

Answer:

1. 8.85 quarts

2. 44.25%

Step-by-step explanation:

In 15 quarts of a solution with percentage of antifreeze = 35%

Amount of antifreeze = 35% × 15

                                    = 0.35 × 15

                                    = 5.25 quarts

that solution is mixed with 5 quarts of a solution with percentage of antifreeze = 72%

Amount of antifreeze = 72% × 5

                                    = 0.72 × 5

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Total amount of mixture = 15 quarts + 5 quarts = 20 quarts

1. Now we will calculate the total amount of antifreeze in the resulting mixture.

= 5.25 + 3.6 = 8.85 quarts

2. The percentage of the resulting mixture is antifreeze

= \frac{8.85}{20}\times 100

= 44.25%

1. total amount of antifreeze is 8.85 quarts

2. the percentage of antifreeze is 44.25%

3 0
3 years ago
Find all angles, 0 ≤C<360 that satisfy the equation below, to the nearest tenth of a degree.
ludmilkaskok [199]

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Readme [11.4K]

Answer: y = $7.50x + $25

Step-by-step explanation:

From the question, we are informed that Lucy is going to walk in a fundraising event to raise money for her school band and her mother has agreed to donate $7.50 to the school for each mile that Lucy walks, plus an additional $25.

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7 0
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