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