a) -3x=2y [] b) 5x+6y=8 y=1-x [] x=4y-1

a) -3x=2y y=1-x -3x=2(1-x) -3x=2-2x -3x+2x=2 -x=2 x=-2 y=1-(-2) y=3 b) 5x+6y=8 x=4y-1 5(4y-1)+6y=8 20y-5+6y=8 26y=13 y=0,5 x=4*0,5-1 x=2-1 x=1