SOLUTION: how do i solve this? the second of two numbers is 7 times the first. their sum is 80

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Question 661977: how do i solve this? the second of two numbers is 7 times the first. their sum is 80
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
x = first number
y = second number
y = 7x
x+y=80
Substitute
x + 7x = 80
8x = 80
x = 10