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

x=15,y=3

Step-by-step 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

6.5

step-by-step explanation:

you said it was in the question

~courtney

the answers are in the images, i received 100% on this assignment. hope this !