3 years ago

In the equation 2r - 7 = 15, what value of r makes this equation true?

Mathematics

1 answer:

liq [111]3 years ago

4 0

Answer:

r = 11 makes 2r - 7 = 15 true.

Step-by-step explanation:

2r - 7 = 15

Add 7 to both sides.

2r = 22

Divide by 2.

r = 11

Proof:

2r - 7 = 15

2(11) - 7 = 15

22 - 7 = 15

15 = 15

You might be interested in

7. Write the equation of a line which passes through the points (-3,5) and (6,23)

faust18 [17]

Answer:

answer to the equation is

$y = 2x + 11$

Step-by-step explanation:

$y = mx + b$

first find the slope of the line using the two points

$slope \: m = \frac{y2 - y1}{x2 - x1} = \frac{23 - 5}{6 - ( - 3)} \\ = \frac{18}{9} \\ slope \: m = 2$

substitute 2 for m and use one of the points for x and y and solve for b

$5 = 2( - 3) + b \\ 5 = - 6 + b \\ 5 + 6 = b \\ b = 11$

Now that you found b, the y-intercept, you can substitute that into the equation for your line

$y = 2x + 11$

7 0

3 years ago

Multiply: –3.2 × (–13) × 6.

PIT_PIT [208]

Answer:

249.6

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Thirty four and nine ten thousandths

dybincka [34]

34.100 efefref evf dewdcec

7 0

3 years ago

In the figure, a ll b and m 6 = 146 degrees <br><br> What is the m 2?

levacccp [35]

Due to m<2 is a corresponding angle to m<6, the answer to the question is 146°.

5 0

4 years ago

GREATEST COMMON FACTOR OF 6 OF 27 AND 30

jonny [76]

Answer is 3.

3,6
3,6,9,12,15,18,21,24,27
3,6,9,12,15,18,21,24,27,30

8 0

3 years ago

Read 2 more answers