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x+5y=-17
{x=-17-5y
-34-10y=10
{x=-17-5y
y=-4,4
{x=5
y=-4,4
c) { 4y-x=6
17y=0
{y=0
x=-6
d) { a=b
2a+b=9
{a=b
3b=9
{a=3
b=3
e) { u=4v
5u-v=10
{u=4v
19v=10
{v=10/19
u=40/19
f) { 3r=s
3r+s=24
{s=3r
s=12
{s=12
r=4
x+5y=-17\*-2
+{2x-y=10
-2x-10y=34
-11y=44
y=-4
2x+4=10
{x=3
y=-4
c) { 4y-x=6
17y=0
{y=0
-x=6
{y=0
x=-6
d) { a=b
2a+b=9
{a=b
3b=9
{b=3
a=3
e) { u=4v
5u-v=10
{5*4v-v=10
u=4v
{19v=10
u=4v
{v=0,5(zaokrąglone)
u=2
f) { 3r=s\*-1
3r+s=24
+{-3r=-s
3r+s=24
2s=24
s=12
3r=12
r=4