Question 82556
Since we have {{{y=2x+3}}} we can substitute this value of y into y of the first equation


{{{-6x + 3(2x+3) = 12}}} Plug in 2x+3 into y


{{{-6x + 6x + 9 = 12}}} Distribute


{{{9 = 12}}} Combine like terms


Since this is never true for any x, we have no solutions which means this system is inconsistent