Question 253858
{{{3x-4y=8}}} Start with the first equation.



{{{3x-4(x-1)=8}}} Plug in {{{y=x-1}}} 



{{{3x-4x+4=8}}} Distribute.



{{{-x+4=8}}} Combine like terms on the left side.



{{{-x=8-4}}} Subtract {{{4}}} from both sides.



{{{-x=4}}} Combine like terms on the right side.



{{{x=(4)/(-1)}}} Divide both sides by {{{-1}}} to isolate {{{x}}}.



{{{x=-4}}} Reduce.



{{{y=x-1}}} Go back to the second equation.



{{{y=-4-1}}} Plug in {{{x=-4}}}



{{{y=-5}}} Subtract



So the solutions are {{{x=-4}}} and {{{y=-5}}} giving us the ordered pair (-4,-5)