solve the linear system using substition:  1) y=2x-1    2x+y=3 2) 2x-y=5    x=y+3 3) 4x-7y=10    y=x-7 4) x=17-4y     -2x+2y=-4 5) 2x+y=9    8x-2y=-30 6) Laura has $4.50 in...

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solve the linear system using substition: 

1) y=2x-1

   2x+y=3

2) 2x-y=5

   x=y+3

3) 4x-7y=10

   y=x-7

4) x=17-4y 

   -2x+2y=-4

5) 2x+y=9

   8x-2y=-30

6) Laura has $4.50 in dimes and quarters. She has three more dimes than quarters. How many quarters does she have?

    • 13 years ago
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