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x = 3y + 30
3x + 6y = 0
now we sub x into the 2nd equation since x = 3y + 30
3(3y + 30) = 0

3(3y +30 ) +6y = 0
sorry

9y + 90 + 6y = 0
15y + 90 = 0
15y = -90
y =-6
now can you find x value?