Zad. 6 Str. 42 ze zbioru zadań dla II gimnazjum
Rozwiąż układy równań.
a) { x= - y
{ x - y = 6
b) { y = x + 3
{ 2x + y = 9
c) { x - 4y = 15
{ y = 4x
d) { y = -2x - 1
{ x = y + 7
e) { - 3x = 2y
{ y = 1 - x
f) { 5x + 6y = 8
{ x = 4y - 1
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a {x=-y {x=-y {x=-y {x=3
{x-y=6 {-y-y=6 {-2y=6/-2 {y=-3
b {y=x+3 {y=x+3 {y=x+3 {y=x+3 {y=3+2 {y=5
{2x+y=9 {2x+x+3=9 {3x+3=9 {3x=6/3 {x=2 {x=2
c{x-4y=15 {x-4*4x=15 {x-16x=15 {-15x=15/-15 {x=-1
{y=4x {y=4x {y=4x {y=4x {y=-4
d{y=-2x-1 {y=-2(y+7)-1 {y=-2y-14-1 {3y=-15/3 {y=-5
{x=y+7 {x=y+7 {x=y+7 {x=-5+7 {x=2
e{-3x=2y {-3x=2(1-x) {-3x=2-2x {-3x+2x=2 {-x=2/-1 {x=-2
{y=1-x {y=1-x {y=1-x {y=1-x {y=1+2 {y=3
f{5x+6y=8 {5(4y-1)+6y=8 {20y-5+6y=8 {26y=13/26 {y=0,5
{x=4y-1 {x=4y-1 {x=4y-1 {x=2-1 {x=1