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x
y
el doble de un numero = 2x
2x +y = 4
y = 4 -2x
si x = 4
y = 4 - 2*4
y = 4 -8
y = -4
si x = 0
y = 4 -2*0
y = 4
si x = 1
y = 4 - 2*1
y = 4 -2
y = 2
si x = 3
y = 4 - 2*3
y = 4 -6
y = -2
si x = -1
y = 4 -2( -1)
y = 4 +2
y = 6