2 years ago

2x-y=6 and 5x+10y=-10

1 answer:

6 0

2x - y = 6
5x + 10y = -10

( 2x - y = 6 ) * 5
10x - 5y = 30

( 5x + 10y = -10 ) * 2
10x + 20y = -20

If we subtract the last 2 equations,
30y = -50
y = -(5/3)

2x - (-5/3) = 6
2x + (5/3) = 6
2x = 6 - (5/3)
2x = (18-5)/3
2x = 13/3
x = 13/6

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