Elementary Algebra 
Solve the following systems by substitution:

1. 2. 3. 
2x + y = 6 y = x  3 6x  4y = 34 y = 3x  4 4x  y = 4 y = 2x 
4. 5. 
x  5y = 1 x = 2y  4 5x + 2y = 15 y = 3x + 2 
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