Using both elimination and substitution methods solve the
following systems of equations (simultaneous equation)
a) y + 2x = 10
y - 2x = 12

b) 2y + x = 10
2y - x = 12

c) 3y - 2x = 15
3y + 2x = 9

d) 2x + 2y = 12
2x - 2y = 12

e) 6x + 4y =20
3x + y = 3

f) y + x = -10
2x -3y = 0

The first one is correct

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