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I need help to solve system by substitution.

6x+3y=0
X+5y=9

well your line 2 says x = 9 - 5 y

substitute that into line 1
so
6 (9-5y) + 3 y = 0
54 - 30 y + 3 y = 0
you solve for y and go back and get x

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