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ddd [48]
2 years ago
15

Which equation is true when r = 7 ?

Mathematics
1 answer:
jeka57 [31]2 years ago
8 0

Answer:

7 = 49 ÷ r

Step-by-step explanation:

To find the equation that is true when r = 7, we need to find a number after the equals sign that is a multiple of 7.

Multiples of 7:  

7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77...

Therefore, the only answer option in which the number after the equals sign is a multiple of 7 is:

7 = 49 ÷ r

To prove this, input r = 7 into each of the equations:

   6 = 30 ÷ r

⇒ 6 = 30 ÷ 7

⇒ 6 ≠ 4.285... ← incorrect!

   7 = 54 ÷ r

⇒ 7 = 54 ÷ 7

⇒ 7 ≠ 7.714... ← incorrect!

   7 = 49 ÷ r

⇒ 7 = 49 ÷ 7

⇒ 7 = 7 ← correct!

   9 = 72 ÷ r

⇒ 9 = 72 ÷ 7

⇒ 9 ≠ 10.285... ← incorrect!

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x-y=6
When y=0
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When x=0
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y=-6  Point is (0,-6)

Now x-intercept and y-intercept for equation 2.
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Now plot these points on the graph, the lines intersect each other at point (5,-1), which is the solution of the given system.

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3 years ago
How to solve 2(x+7)=-4x+14
Temka [501]

Answer:

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Step-by-step explanation:

8 0
3 years ago
Explain how you would factor 9x^2 – 49 show your work and use complete sentences. what is this special type of factoring called?
tatuchka [14]
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= (3x + 7)(3x - 7)

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Answer:

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Step-by-step explanation:

Let the amount of time she spends on walking be x

d/3 + d/9 = 6            Multiply by 9

3d + d = 6*9

4d = 54                     Divide by 4

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d/3 = 13.5/3 = 4.5 hours

d/9 = 13.5/<u>9 = 1.5 hours</u>

Total                6 hours

I hope this is the right interpretation.

7 0
2 years ago
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