X- y = 2
0.2x + 0.4y = 1
the x-coordinate of the solution to the system shown is
1
3
6

Sustitution: 
x - y = 2 
x = y + 2 
substitute y + 2 for x in the other equation 
0.2(y + 2) + 0.4y = 1 
0.2y + 0.4 + 0.4y = 1 
0.6y = 0.6 
y = 1 
x - 1 = 2 
x = 3 

elimination: 
x - y = 2 
-0.2(x - y) = -0.2(2) 
-0.2x + 0.2y = -0.4 

-0.2x + 0.2y = -0.4 
0.2x + 0.4y = 1 
 
0.6y = 0.6 
y = 1 
x - 1 = 2 
x = 3

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