6x-3y=9 and y=x+1
from 6x - 3y = 9
Divide both sides by 3
2x - y = 3
sub y = x + 1 into the equation
2x - x - 1 = 3
x - 1 = 3
x = 3 + 1
= 4
since y = x + 1
y = 4 + 1
= 5
Hence x = 4, y = 5
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