Question

the sum of two numbers is 36 and their difference is 9. find the two numbers substitution method ​

Answer 1

x + y = 36

x - y = 24

Now add the two equations together. Since one has a +y and one has a -y, the y's will cancel and just x will remain.

2x = 60

x = 30

Now substitute 30 for x in one of the equations and solve for y.

30 + y = 36

y = 6

So the answer is 6 and 30.