Answer: 22
Step-by-step explanation:
3x + 5y = 2 .......................... equation 1
2x - 6y = 20 ........................... equation 2
solving the system of linear equation by elimination method. Multiply equation 1 by 2 and equation 2 by 3 , then we have
6x + 10y = 4 ............................. equation 3
6x - 18y = 60 ........................... equation 4
subtract equation 3 from equation 4 , then we have
-28y = 56
divide through by -28
y = -2
substitute y = 2 into equation 1 to find the value of x , then we have
3x + 5 (-2) = 2
3x - 10 = 2
3x = 2 + 10
3x = 12
x = 4
Therefore :
5x - y = 5 (4) - (-2)
= 20 + 2
= 22
