Question

A first number is four more than seven time a second. The sum of the number is 92. Find the number.​

Answer 1

11

81

Explanation:

x = 7y + 4

x + y = 92

Solve for x in the second equation

x = 92 - y

92 - y = x

Equate the 2 xs

92 - y = 7y + 4 Add y to both sides

92 = 7y+y + 4 Combine

92 = 8y + 4 Subtract 4 from both sides

88 = 8y Divide by 8

88/8 = y

y = 11

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x = 7y + 4

x = 77 +4

x = 81