Question 960855

x=first number; y=second number
x-y=11
x=11+y
2x+y=12 Substitute for x
2(11+y)+y=12
22+2y+y=12 Subtract 22 from each side.
3y=-10 Divide each side by 3
y=-10/3 ANSWER 1: The second number is -10/3.
x=11+y=11-10/3=23/3 ANSWER 2: The first number is 23/3.
CHECK:
23/3-(-10/3)=11
33/3=11
11=11
2x+y=12
2(23/3)+(-10/3)=12
46/3-10/3=12
36/3=12
12=12