Rozwiąż metodą podstawiania
a) {3x+y=5
{2x-y=0
b) {2x-y=5
{x+y=4
a) {3x+y=5 {2x-y=0
{y=5-3x
{y=2x
{5-3x=2x
{5=5x /:5 (podzielic przez dwie strony)
{x=1
{y=2
b) {2x-y=5 {x+y=4
{-y=5-2x
{x=4-y
{x=4+5-2x
{3x=9 /:3
{x=3
{-y=5-2*3
{-y=-1
{y=1
{3x+y=5
{2x-5+3x=0
{5x=5
{y=5-3
---------
{2x-y=5
{2(4-y)-y=5
{8-3y=5
{-3y=-3
{x=4-1
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a) {3x+y=5
{2x-y=0
{y=5-3x
{y=2x
{y=5-3x
{5-3x=2x
{y=5-3x
{5=5x /:5 (podzielic przez dwie strony)
{y=5-3x
{x=1
{y=2
{x=1
b) {2x-y=5
{x+y=4
{-y=5-2x
{x=4-y
{-y=5-2x
{x=4+5-2x
{-y=5-2x
{3x=9 /:3
{-y=5-2x
{x=3
{-y=5-2*3
{x=3
{-y=-1
{x=3
{y=1
{x=3
{3x+y=5
{2x-y=0
{y=5-3x
{2x-y=0
{y=5-3x
{2x-5+3x=0
{y=5-3x
{5x=5
{y=5-3x
{x=1
{y=5-3
{x=1
{y=2
{x=1
---------
{2x-y=5
{x+y=4
{2x-y=5
{x=4-y
{2(4-y)-y=5
{x=4-y
{8-3y=5
{x=4-y
{-3y=-3
{x=4-y
{y=1
{x=4-y
{y=1
{x=4-1
{y=1
{x=3