Potrzebuję na dziś ! Układy równań !
a)
(x - y = 1
(2x + 3y = 7
b)
(-x + 2y = 1
(2x - 3y = 6
c)
(2x - y = 8
(x + 2y = -1
d)
(2x - y = -10
(2x - 3y = -18
e)
(x + 2y = -8
(-5x - 2y = -12
f)
(2x + y + 1 = 0
(3x + y - 16 = 0
Z góry dzięki :)
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a)
{x-y=1/*3
{2x+3y=7
{3x-3y-3
{2x-3y=7
{5x=4/:5
{x= 5/4
5/4-y=1
y=1/4
b)
{-x+2y=1/*2
{2x-3y=6
{-2x+2y=1
{2x-3y=6
{-y=7/*(-1)
{y=-7
{-x+2*(-7)=1
{-x=15/*(-1)
{x= (-15)
d)
{2x-y=-10/*-3
{2x-3y=-18
{-6x+3y=30
{2x-3y=-18
{-4x=12/:4
{x=-3
{2*(-3)-y=-10
{-y=16
{y=-16
e)
{x+2y=-8
{-5x-2y=-12
{-4x=-20/:-4
{x=5
{5+2y=-8
{2y=-13/:2
{y=-6,5
f)
{2x+y+1=0/*-1
{3x+y-1'6=0
{ -2x-y-1=0
{3x+y-1'6=0
{x=2,6
{-2*2,6-1-y=0
{-5,2-1-y=0
{-y=6,2
{y=-6,2
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