Explanation:
2x-15y=6---->1
x-6y=-1
x=-1+6y----->2
use substitution
substitute 2 in 1
2(-1+6y)-15y=6
-2+12y-15y=6
-3y=6+2
-3y=8
y=-8/3
x=1+6(-8/3)
x=1+(-16)
x=-15
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