All categories

2 years ago

If 5 + b = 3 and a - b = 7 , then which of the following is true?

Mathematics

2 answers:

brilliants [131]2 years ago

4 0

2a plus 6 equl eight i hink so

ira [324]2 years ago

4 0

Answer:

Solve the given system first

5 + b = 3
a - b = 7

Find b:

b = 3 - 5 = -2

Find a:

a - (-2) = 7
a = 7 - 1
a = 5

Verify the options for correctness:

2a + b = 2(5) + (-2) = 10 - 2 = 8, correct
2a - 2b = 2(5) - 2(-2) = 10 + 4 = 14, incorrect
a - 2b = 5 - 2(-2) = 5 + 4 = 9, incorrect
2(a - b) = 2(5 - (-2)) = 2(7) = 14, incorrect

You might be interested in

Which expression is equivalent to this expression? thank you :)

CaHeK987 [17]

Answer:

C. -4x - 1

Step-by-step explanation:

$-\frac{1}{2}(8x+2)$

Distribute the term outside of the parenthesis, Multiply each term in the parenthesis by the term outside (do not forget to include the negative sign when multiplying);

$(-\frac{1}{2}(8x))+(-\frac{1}{2}(2))$

Simplify,

$-4x - 1$

6 0

2 years ago

Estimate the number of times an average person's heart beats in a lifetime. assume the average heart rate is 69 beats/min and a

rusak2 [61]

It would be approximately 2,719,980,000 beats in their entire lifetime.

4 0

3 years ago

Read 2 more answers

Please answer this question

stira [4]

Graph 1: Domain = 2 <= x < 12

Graph 1: Range = {2,4}

Graph 2: Domain = 3 <= x <= 10

Graph 2: Range = -6 <= y <= 4

Graph 3: Domain = 4 < x < 11

Graph 4: Range = -6 <= y < 2

3 0

2 years ago

The phrase "4 more than twice a number" becomes '2n + 4'.

andrew11 [14]

I mean, this isn't a question but its true?

3 0

2 years ago

The _______ represents half the distance between the maximum of a sine or cosine graph

ziro4ka [17]

Answer: amplitude

Step-by-step explanation: The amplitude represents half the distance between the maximum of a sine or cosine graph.

3 0

3 years ago