Odpowiedzi

2010-02-28T19:39:48+01:00
1) {6x-17y=11
{-5x+15y=10 |÷(-5)
{6x - 17y=11
{x=-2+3y
{6 (-2+3y) - 17y = 11
{x=-2+3y
{-12 + 18y - 17y = 11
{x=-2+3y
{y=23
{x=67

2){24x-16y=-8
{16x + 4y=24 | ÷4
{24x-16y=-8
{y=6-4x
{24x-16 (6-4x)=-8
{y=6-4x
{24x-96+64x=-8
{y=6-4x
{88x=88
{y=2
{x=1

3){2t- s=5
{s+ t=3
{2 (3-s) - s=5
{t=3-s
{6 - 2s - s=5
{t=3-s
{-3s=-1
{t= 2⅓
{s=⅓

4) {b-3a=17
{4a+ 2b=44
{b=17+3a
{4a+2 (17+3a)=44
{b=17+3a
{4a+34+6a=44
{b=17+3a
{10a=10
{b=20
{a=1
2010-02-28T19:49:59+01:00