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Scorpion4ik [409]
3 years ago
6

anonymous 2 years ago If you were to solve the following system by substitution, what would be the best variable to solve for an

d from what equation? 2x+6y=9 3x-12y=15 A.y, in the second equation B.x, in the first equation C.y, in the first equation D.x, in the second equation Calculus1
Mathematics
1 answer:
Ainat [17]3 years ago
7 0
I'm sorry that I'm not in calculus, but hopefully I can help.
Personally, I would choose: D.) x; in the second equation ;
because it has easier numbers to figure out, you'll get it eventually...
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During a tunnel construction project, engineers used explosives to excavate partway into a mountain. Because of time constraints
AnnyKZ [126]

The given data can be tabulated as:

number of days,x                            length of tunnel (ft), y

0                                                                              225

5                                                                              350

20                                                                           725

30                                                                           975

55                                                                           1,600

 

To check if the growth is linear, the slope at points (0, 225) and (5, 350), and (0, 225) and (20, 725) should be equal. The formula for slope is:

m = (y2 – y1) / (x2 – x1)

 

Finding for slope (0, 225) and (5, 350):

m = (350 – 225) / (5 – 0) = 25

 

Finding for slope (0, 225) and (20, 725):

m = (725 – 225) / (20 – 0) = 25

 

Therefore the equation is linear in the form of:

y = mx + b

where b is the value of y at x = 0, so b = 225

 

The complete equation is:

y = 25x + 225

 

At x = 86 days

y = 25(86) + 225

y = 2,375 ft

 

Therefore the length of the completed tunnel is 2,375 feet.

5 0
3 years ago
Reorganize the topic and the answer.
wel
Which u need help on ?
7 0
2 years ago
Read 2 more answers
What is the slope and y-intercept of line q graphed below?
beks73 [17]

The correct answer is C) 1/3 and (0, 1)

The y-intercept part is somewhat simple. In order for it to be a y-intercept, the x value of the ordered pair must be 0. That is only true in B and C, therefore they are the only possible answers.

To find the slope, we must choose two points on the line and use the slope formula. We can start by using the y-intercept (0, 1) and also (3, 2). Now we use the slope formula.

m = (y2 - y1)/(x2 - x1)

In this equation m is equal to slope, the first point is (x1, y1) and the second point is (x2, y2)

m = (y2 - y1)/(x2 - x1)

m = (2 - 1)/(3 - 0)

m = 1/3

Now knowing the slope, you can match this with answer C.

3 0
3 years ago
Find slope of the line -12x+13y=-6
Burka [1]

Answer: 2 x - 3 y = 6 i think but let let me know if i'm wrong

7 0
3 years ago
Write an inequality to match this statement: 14 is greater than 10. **Hint** You need to use shift and the comma button or the p
KIM [24]

Answer:

14>10

Step-by-step explanation:

6 0
2 years ago
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