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Alex787 [66]
3 years ago
10

-3+3x=-2(x+1) the 2 is a negative please break it down

Mathematics
2 answers:
Veronika [31]3 years ago
7 0
-3+3x=-2(x+1) First: I will get rid of the bracket:


-3+3x=-2x-2

Now, all the x goes to the left side, all the numbers without x to the right side:


3x+2x=-2+3

we add up"

5x=1

divide by 5:

x= \frac{1}{5}

coldgirl [10]3 years ago
5 0
-3 + 3x = -2(x + 1)

First, regroup your terms. / Your problem should look like: 3x - 3 = -2(x + 1)
Second, expand. / Your problem should look like: 3x - 3 = -2x - 2
Third, add 3 to both sides. / Your problem should look like: 3x = -2x - 2 + 3
Fourth, simplify -2x - 2 + 3 to -2x + 1. / Your problem should look like: 3x = -2x + 1
Fifth, add 2x to both sides. / Your problem should look like: 3x + 2x = 1
Sixth, add 3x + 2x to get 5x. / Your problem should look like: 5x = 1
Seventh, divide both sides by 5. / Your problem should look like: x =  \frac{1}{5}

Answer as fraction: x = \frac{1}{5}
Answer as decimal: x = 0.2

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Gasoline costs $2.79 per gallon Is the number of gallons proportional to the total cost
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Gasoline costs $2.79 per 2 gallon. How much will it cost for 8 gallon. Then, we cross multiply and all to find the answer.
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Consider the following argument: If pigs have wings, then pigs can fly. If pigs are lighter than air, then pigs can fly. Pigs ha
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3 0
3 years ago
Avery can run at 10 uph. The bank of a river is represented by the line 4x + 3y = 12, and Avery is at (7, 5). How much time does
Reil [10]
The minimum distance will be along a perpendicular line to the river that passes through the point (7,5)

4x+3y=12

3y=-4x+12

y=-4x/3+12/3

So a line perpendicular to the bank will be:

y=3x/4+b, and we need it to pass through (7,5) so

5=3(7)/4+b

5=21/4+b

20/4-21/4=b

-1/4=b so the perpendicular line is:

y=3x/4-1/4

So now we want to know the point where this perpendicular line meets with the river bank.  When it does y=y so we can say:

(3x-1)/4=(-4x+12)/3  cross multiply

3(3x-1)=4(-4x+12)

9x-3=-16x+48

25x=51

x=51/25

x=2.04

y=(3x-1)/4

y=(3*2.04-1)/4

y=1.28

So now that we know the point on the river that is closest to Avery we can calculate his distance from that point...

d^2=(x2-x1)^2+(y2-y1)^2

d^2=(7-2.04)^2+(5-1.28)^2

d^2=38.44

d=√38.44

d=6.2 units

Since he can run at 10 uph...

t=d/v

t=6.2/10

t=0.62 hours  (37 min 12 sec)

So it will take him 0.62 hours or 37 minutes and 12 seconds for him to reach the river.




8 0
3 years ago
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