## Elementary Linear Algebra 7th Edition

40$x_{1}$ + 30$x_{2}$ = 24 20$x_{1}$ + 15$x_{2}$ = -14 Multiply second equation by (-2) then add it to the first. 40$x_{1}$ + 30$x_{2}$ = 24 -40$x_{1}$ - 30$x_{2}$ = 28 0 = 52 0 $\ne$ 52, so it has no solution