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Tanzania [10]
3 years ago
5

What makes the open sentence 7x - 7 = 2x + 8 true

Mathematics
2 answers:
lukranit [14]3 years ago
8 0

7x - 7 = 2x + 8

7x - 2x = 8 + 7

5x = 15

 x = 3

Answer

C. X = 3

taurus [48]3 years ago
4 0

If we plug x = 3 into the equation we have

7(3) - 7 = 14

and

2(3) + 8 = 14

So the answer is C

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Y/xz=c. Combined variation or joint variation?
kotykmax [81]

Answer:

Joint variation

Step-by-step explanation:

7 0
4 years ago
Suppose line segment AB has one endpoint at A(0, 0). What are the coordinates of B if (5, 3) is 1/3 of the way from A to B?
Bumek [7]

Given:

Line segment AB has one endpoint at A(0,0).

(5, 3) is 1/3 of the way from A to B.

To find:

The coordinates of point B.

Solution:

Let the coordinates of point B are (a,b).

Suppose point P(5, 3) is 1/3 of the way from A to B.

\dfrac{AP}{AB}=\dfrac{1}{3}

\dfrac{AP}{PB}=\dfrac{AP}{AB-AP}=\dfrac{1}{3-1}=\dfrac{1}{2}

It means, point P(5, 3) divides the segment AB in 1:2.

Section formula:

If a point divides a line segment in m:n, then

Point=\left(\dfrac{mx_2+nx_1}{m+n},\dfrac{my_2+ny_1}{m+n}\right)

Point P(5, 3) divides the segment AB in 1:2. Using section formula, we get

P=\left(\dfrac{1(a)+2(0)}{1+2},\dfrac{1(b)+2(0)}{1+2}\right)

(5, 3)=\left(\dfrac{a}{3},\dfrac{b}{3}\right)

On comparing both sides, we get

\dfrac{a}{3}=5

a=15

\dfrac{b}{3}=3

b=9

Therefore, the coordinates of point B are (15,9).

8 0
3 years ago
What is the solution for x in the equation 9-10x=2+1-8
Elena-2011 [213]

Answer:

x=7/5

Step-by-step explanation:

First you need to get X by itself. You simplify the right side, getting -5, and then subtract 9 from both sides, getting -10x on one side and -14 on the other. Divide both sides by -1, getting 10x=14, divide both sides by 10 which leaves x=14/10. This can be simplified to be 7/5

6 0
3 years ago
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Charlie drove 495 miles in 9 hours. How long would it take to drive 715 miles?
slava [35]

Answer:

13 hours

Step-by-step explanation:

if he drives 495 miles in 9 hours, he drives 55 miles each hour. 55x13=715

6 0
3 years ago
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Which graph is steeper: y = -20x + 1 or y = 10x + 1?
Anna11 [10]

Answer: y = -20x + 1

Step-by-step explanation:

The larger the m value is in y = mx + b is, the steeper the slope is.

8 0
2 years ago
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