What is the sum of two numbers is 45 and theire difference is 5

Question

Mathematics

Marshall Serrano

5 August, 13:00

What is the sum of two numbers is 45 and theire difference is 5

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Answers (1)

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Roger Case · Answer 1

let the two numbers be x and y

x+y=45 (equation 1)

x-y=5 (equation 2)

from equation (1) y=45-x (equation 3)

substitute 45-x for y in equation 2

x - (45-x) = 5

x-45+x=5

x+x-45=5

2x-45=5

2x=45+5

2x=50

x=50/2

x=25