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Mnenie [13.5K]
3 years ago
13

What is 7x+5=-9? Show your work.

Mathematics
2 answers:
dexar [7]3 years ago
5 0
7x+5=-9
Subtract 5 on both sides
7x=-14
Divide 7 on both sides
X=-14/7=
-2
vagabundo [1.1K]3 years ago
4 0

We have

7x+5=-9.

1. Subtract 5 from both sides to get

7x=-9-5\Longrightarrow 7x=-14.

2. Divide both sides by 7 to get

x=\dfrac{-14}{7}=\boxed{-2}

Hope this helps.

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6x + 2x - 9 = 7<br> Solve the equation and simplify the answer
Tems11 [23]

Answer:

x=2

Step-by-step explanation:

6x+2x-9=7

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8x-9=7

Add 9 to each side

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Divide by 8 on each side

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8 0
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a local coffee shop sold out 1/3 of their coffee on monday. on tuesday they sold 5/6 of what rhey sold on monday. How many coffe
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5/18

Step-by-step explanation:

1/3 on monday

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lidiya [134]
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3 years ago
Arectangularplotoflandistobefencedinusingtwokinds of fencing. Two opposite sides will use heavy-duty fencing selling for $3 a fo
svlad2 [7]

Answer:

Dimensions of the rectangular plot will be 500 ft by 750 ft.

Step-by-step explanation:

Let the length of the rectangular plot = x ft.

and the width of the plot = y ft.

Cost to fence the length at the cost $3.00 per feet = 3x

Cost to fence the width of the cost $2.00 per feet = 2y

Total cost to fence all sides of rectangular plot = 2(3x + 2y)

2(3x + 2y) = 6,000

3x + 2y = 3,000 ----------(1)

3x + 2y = 3000

      2y = 3000 - 3x

      y = \frac{1}{2}[3000-3x]

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Now area of the rectangle A = xy square feet

A = x[1500-\frac{3x}{2}]

For maximum area \frac{dA}{dx}=0

A' = \frac{d}{dx}(1500x-\frac{3}{2}x^{2}) = 0

1500 - 3x = 0

3x = 1500

x = 500 ft

From equation (1),

y = 1500 - \frac{3}{2}\times 500

y = 1500 - 750

y = 750 ft

Therefore, for the maximum area of the rectangular plot will be 500 ft × 750 ft.

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8 0
3 years ago
Use elimination to solve each system of equations.<br><br> 1. 3x+4y=29<br> 6x+5y=43
kakasveta [241]

Answer:

Step-by-step explanation:

3x+4y=29 .......(1)

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Multiply equation (1) by 2

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4 0
3 years ago
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