Question

Solve the system by substitution. In the space provided, type the answer without any

spaces between the letters, numbers, or symbols.
3. x - y= 12
x + y = 18

Answer 1

x=15,y=3

Explanation:

x-y=12

x+y=18

now,x=12+y

substituting in x+y=18

(12+y)+y=18

12+2y=18

2y=18-12

2y=6

y=6/2

y=3

now,x=12+y

so,x=12+3

x=15