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2) 4x + 2y = 30
Despejo x de 1)
3x + 6 = y
3x=y-6
x=(y-6)/3⇔ Sustituyo en x de 2)
4x + 2y = 30
(4(y-6)/3) +2y=30
(4y-24)/3 +2y=30
Sacamos el mcm
(4y-24 +6y)/3=30
10y-24=90
10y=90+24
y=114/10
y=57/5 ⇔Sutituyo en Ec1
3x + 6 = y
3x+6=57/5
3x=57/5 -6
3x=(57-30)/5
3x=27/5
x=27/15
x=9/5
Respuesta
x=9/5
y=57/5