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Musya8
13 days ago
6

Devon wants to write an equation for a line that passes through 2 of the data points he has collected. The points are (8, 5) and

(–12, –9). He writes the equation 7x – 10y = 3. Is this a good model? Explain your reasoning.
Mathematics
2 answers:
Leona [4.1K]13 days ago
8 0
The points given are (8,5) and (-12,-9). Calculating slope: slope = (-9 minus 5) divided by (-12 minus 8) equals -14 over -20, simplifying to 7 over 10. The line equation format is y = mx + b, with slope m = 7/10. Using point (8,5), substitute x = 8 and y = 5 to solve for b: 5 = 7/10 times 8 plus b; 5 = 56/10 plus b; subtracting 56/10 from both sides gives 5 minus 56/10 equals b; converting 5 to 50/10 minus 56/10 equals b; so b equals -3/5. Thus, the equation is y = (7/10)x - 3/5. Converting to standard form: multiply both sides by 10 gives 10y = 7x - 6; subtract 7x to get -7x + 10y = -6; multiply both sides by -1 results in 7x - 10y = 6. Therefore, the equation 7x - 10y = 3 is incorrect because the points do not satisfy it.
tester [3.9K]13 days ago
7 0

Answer:

Step-by-step explanation: Given points (8,5) and (-12,-9), calculate slope as (-9 - 5) divided by (-12 - 8), which is -14/-20, simplifying to 7/10. The line equation y = mx + b uses slope m = 7/10. Utilizing point (8,5), set x = 8 and y = 5 and solve for b: 5 = (7/10)*8 + b; thus 5 = 56/10 + b; subtracting 56/10 from both sides gives 5 - 56/10 = b; converting 5 into 50/10 yields 50/10 - 56/10 = b; so b = -3/5. The resulting equation is y = (7/10)x - 3/5. To write in standard form, multiply both sides by 10: 10y = 7x - 6; then subtract 7x: -7x + 10y = -6; multiplying both sides by -1 yields 7x - 10y = 6. Hence, the equation 7x - 10y = 3 is not a good fit because these points do not satisfy it.

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Answer: It’s two trees

Step-by-step explanation:

Given that the city plants a tree every 20 feet along Dayton Avenue, we first need to establish the length of the side that faces Dayton Avenue.

We currently have three sides unaccounted for. However, it’s crucial to note that the side next to Dayton Avenue has the same length as the two unaccounted sides combined. This equivalence holds because both lengths include the 1 feather and 2 feather markers, confirming congruence.

Thus, the sum of both side lengths will be 234-52-68=114.

Consequently, the side next to Dayton Avenue measures

114\div2=57 feet.

Having determined that this side is 57 feet long, we divide this length by 20 to find the tree planting intervals. Since the planting occurs only in complete 20-foot segments, if the division results in a decimal, we must round down. A tree is only planted if complete segments of 20 feet are reached.

57\div20=2.85

This rounding process gives us 2.

I hope this clarifies!

3 0
10 days ago
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The expression indicates that the total earnings of Mike over the two weeks amount to 2.05x dollars

Solution:

It is given that Mike earned x dollars during the first week at his new job,

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To determine: Total earnings over the two weeks

From the information provided,

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Earnings in the second week = x + 5% of x

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Therefore, earnings in the second week equal to 1.05x dollars

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3 days ago
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Answer:

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