Question

The sum of two numbers is 29.One number is 7 less than twice the other number .Solve the two equations by substitution method. ​

Answer 1

Answer:

To answer the first part of your question “what is the sum of two numbers that are 18?” 18 + 18 = 36. To answer the next part “and their difference is 2”.

Answer 2

Answer:

Step-by-step explanation:

So let x = the first number and let y be the "other" number.

 

So the first statement means that x = 2y - 7 -- 7 more than twice the other number.

 

And the second statement says that x + y = 29

 

So that gives you two equations with two unknowns:

 

x = 2y - 7

x + y = 29

 

So you just have to solve these.

 

Since the first equation gives you an easy expression for x, just substitute that into the second equation:

x + y = 29

(2y - 7) + y = 29

3y - 7 = 29

3y =22

y =  7.3.....

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