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solve each system of equations by substitution

1. y = 2x and x + y = 6

2. 5x + 10y = 3 and x = -1/2y

Answer :

Answer:

1. y = 2x and x + y = 6

x+2x=6

3x=6

3x/3=6/3

x=2

2. 5x + 10y = 3 and x = -1/2y

5(-1/2y)+10y=3

-2.5y+10y=3

7.5y=3

7.5y/7.5=3/7.5

y=0.4

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