If x + y = 12 and 3x - y = 20, find the value of 2x - y
A
8
B
10
C
12
D
15
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
x + y = 12
+ 3x - y = 20
---------------
4x = 32
x = 8
x + y = 12; 8 + y = 12; y = 12 - 8
= 4
2x - y = 2(8) - 4; 16 - 4 = 12
Source: Myschool Past Questions Archive (Record #36179)