Przykład 1: x-y=7 / -y 8x+6y=42 x=7+y 8(7+y) +6y=42 56+8y+6y=42 56+14y=42 14y=-14 y=-1 x=7+(-1)=7-1=6 x=6 y=-1 Przykład 2: x+3y=4 /-3y 5x+2y=7 x=4-3y 5(4-3y)+2y=7 20-15y+2y=7 -13y=-13 y=1 x=4-3*1=4-3=1 x=1 y=1
1. x=7+y 8(7+y)+6y=42 56+8y +6y =42 14y = 42- 56 14y = - 14 / : 14 y = -1 x = 7-1 x=6 y= -1 2. x=4-3y 5x+2y=7 5(4-3y) +2y=7 20 -15y +2y = 7 13y= -13 y = -1 x = 4+3
x-y=7 8x+6y=42 Ipodzielić na 6 x-y=7 8/6x+y=7 x-y+4/3x+y=14 3 1/3x=14 Ipodzielić na 3 1/3 x=4 1/5 4 1/5 - y=7 -y=7-4 1/5 -y= 2 4/5 y= -2 4/5 2. x+3y=4 5x+2y=7 Ipodzielić na -5 x+3y=4 -x-2/5y=-7/5 x+3y-x-2/5y= 4-7/5 2 3/5y= 2 3/5 y=1 x+3=4 x=1
