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Jet001 [13]
3 years ago
13

If x-12y=-210 and x-6y=90 solve for x

Mathematics
1 answer:
Contact [7]3 years ago
8 0

Multiply the second equation by 2 to get


2x-12y=180


Now subtract the first equation from this to get


x = 390



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Jeremy wanted to buy a used car for $4000. He had to pay 8% in sales tax. How much is he paying for the car?
lord [1]

Answer:

he pays 4320 :)

Step-by-step explanation:

5 0
3 years ago
Complete the point slope equation of the line through (-5, 7) and (-4, 0).​
IgorLugansk [536]

For this case we have that by definition, the point-slope equation of a line is given by:

y = mx + b

Where:

m: It's the slope

b: It is the cut-off point with the y axis

We have two points:

(x_ {1}, y_ {1}): (- 5,7)\\(x_ {2}, y_ {2}): (- 4,0)

We found the slope:

m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}} =  \frac {0-7} {- 4 - (- 5)} = \frac {-7} {-4 + 5} = \frac {-7} {1} = - 7

Thus, the equation is of the form:

y = -7x + b

We substitute one of the points and find "b":

0 = -7 (-4) + b\\0 = 28 + b\\b = -28

Finally, the equation is:

y = -7x-28

Answer:

y = -7x-28

5 0
4 years ago
At an output level of 50 units per day, a firm has average total costs of $60 and average variable costs of $35. Its total fixed
e-lub [12.9K]

Answer:

$ 1250

Step-by-step explanation:

output = 50 units per day

average total cost = $ 60

total cost = output × average total cost =50 × 60 = $ 3000

total variable cost = output × average variable cost = 35 × 50 = $ 1750

total cost = total fixed cost + total variable cost

total fixed cost = total cost - total variable cost = $ 3000 - $ 1750 = $ 1250

5 0
3 years ago
Can someone explain part c to me please?
Eduardwww [97]

Answer:

)  = 23 °C

ii) = 4.4° C

Step-by-step explanation:

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Thus; using the equation, the temperature, y will be;

y = 23 - 5x

y = 23 - 5(0)

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ii) the temperature change for every kilometer from the surface,

From the equation;

y = 23 - 5x

we take, y to be 1

Therefore;

1 = 23 -5x , subtracting 23 on both sides we get

-22 = -5x

x = -22/-5

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4 0
4 years ago
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Ethan can conclude that the new medication is effective in reducing sneezing, because the group that received the new medication showed lower signs of sneezing, which was the purpose of the medication.
8 0
3 years ago
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