Question

The sum of two numbers is 138. One number is 20 less than the other. Find the numbers.

Answer 1

Explanation:

x + y = 138

x = y - 20

(y - 20) + y = 138

2y - 20 = 138

2y = 158

y = 79

Answer x = 79 - 20 = 59 = x

Answer 2

Step-by-step explanation:This is two variables and two equations. x and y will be the two different numbers.

1.x + y =138

2.x= y-20

plug #2 into #1.

(y-20) + y = 138

2y - 20 = 138

2y = 158

y = 79 and plug into #2 and find x.

x = 79-20 = 59 = x