1 {2x-y=10 x=17-5 2razy12-y=10 24-y=10 y=14 2x-14=10 2x=22/2 x=12 2 {n=9-3n 2m-5(9-3n)= -11 2m-45+15m= -11 17m=34/17 m=2 n=3 3 {4a-2=b 3a+7b=1,5 {b=4a-2 3a+7b=1,5 3a+7(4a-2)=1,5 31a=15,5/31 a=0,5 b=4razy0,5-2 b=0 4 {5x=4-2(3-4x) y=3-4x 13x=-2/13 x=-6,5 y=26 5 {6(-9,5-5y)-3y=9 x=-9,5-5y 33y=66/-33 y=-2 x=0,5
1. 2x-y=10 | *5 x+5y= -17 10x-5y=50 x=5y=-17 11x=33 | :11 x=3 2x-y=10 2*3-y=10 6-y=10 -y=10-6 | :(-1) y=-4 2. 3m+n=9 | *5 2m-5n= -11 15m+5n=45 2m-5n=-11 17m=34 | :17 m=2 2m-5n=-11 2*2-5n=-11 4-5n=-11 -5n=-11-4 -5n=-15 | :(-5) n=3 3. 4a-b=2 | *7 3a+7b=1,5 28a-7b=14 3a+7b=1,5 31a=15,5 | :31 a=0,5 4a-b=2 4*0,5-b=2 2-b=2 -b=2-2 | :(-1= b=0 4. 5x+2y=4 4x+y=3 | *(-2) 5x+2y+4 -8x-2y=-6 -3x=-2 | :(-3) x=2/3 4x+y=3 4*2/3+y=3 2i2/3+y=3 y=3-2i2/3 y=1i1/3 5. 6x-2y=9 x+5y=-9,5 | *(-6) 6x-2y=9 -6x-30y=57 -33x=66 | :(-33) x=-2 6x-3y=9 6*(-2)-3y=9 -12-3y=9 -3y=9+12 -3y=21 | :(-3) y=-7
