Question

3x+5y=6,9x-15y=(-6) do in substitution method​

Answer 1

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