A 5y=2 / :5 x+y=2⅖ y=⅖ x+⅖=2⅖ y=⅖ x=2 B y=0 x=-6 C a=b 2a+b=9 2a+a=9 3a=9 a=3 D u=4v 5u-v=10 5*4v-v=10 19v=10/:19 v=¹⁰/₁₉ u=4*¹⁰/₁₉ u=⁴⁰/₁₉ u=2 i2dziewietnaste E 3r=s 3r+s=24 3r=s 3r+3r=24 6r=24 /:6 r=4 s=3*4 r=4 s=12
A) (5y=2 (x+y=2 2/5 5y=2 x+y=12/5 |*(-5) 5y=2 -5x-5y=-12 -5x=-10 x=2 5y=2 y=0,4 B) (4y-x=6 (17y=0 y=0 4y-x=6 0-x=6 x=-6 C) (a=b |*(-2) (2a+b=9 -2a=-2b 2a+b=9 -b=9 b=-9 2a+b=9 2a-9=9 2a=18 a=9 D) (u=4v (5u-v=10 u=4v 5*4v-v=10 u=4v 20v-v=10 19v=10 v=10/19 u=4v u=4*10/19 u=40/19 E) (3r=s (3r+s=24|*(-) 3r=s 3r+3r=24 3r=s 6r=24 |:6 r=4 3r=s 12=s
