so basically what you would is u would plug the first equation into the second equation. -5x+21=4x+6 -21 -21 -5x=4x-15 -4x -4x -9x=-15 -9x/-9=15/-9 x=-1.66 then you would plug x back into the equation to get your y value y=4(-1.66)+6 y=6.64+6 y=12.64
