Solve by substitution method and elimination method.
1. 2x + 3y =5; x-2y =3
2. 5x+ 3y =35; 2x+4y=28
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elimination method
2x+3y=5
(x-2y=3) 2
2x-4y= 6
2x+3y=5 subtract
2x-4y=6
y= -1/7
x=19/7
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