3x+5y=6,9x-15y=(-6) do in substitution method
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3x+5y-6=0_____1
9x-15y+6=0____2
from eq.1
3x=6-5y
x=6-5y/3_______3
substituting the value of x in eq.2
9x-15y+6=0
9 (6-5y/3)-15y+6=0
3 (6-5y)-15y+6=0
18-15y-15y+6=0
-30y+24=0
-30y=-24
y=24/30
y=8/10
y=0.8
from eq.3
x=6-5y/3
=6-5×0.8/3
=6-4/3
=2/3
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