Uklady rownań
a) {12a-7b=-16 b) {11x+17y=45 c) {8a+9b=36
{a-3b=-69 {13x+y=15 {a-16b=210
Kto pierwszy dam naj:P
Odpowiedzi
a) {12a-7b=-16
{a-3b=-69
{12(3b-69) -7b = -16
{a=3b - 69
{36b - 828 - 7b = -16
{a=3b-69
{36b-7b= -16+ 828
{a=3b-69
{29b= 812 /:29
{a=3b -69
{b=28
{a=3*28 - 69
{b=28
{a= 15
b) {11x+17y=45
{13x+y=15 /* -17
{11x+17y = 45
{-221x -17y = -255 +
---------------------
11x-221x-17y+17y= 45 - 255
210x=210 /:210
x=1
11*1 +17y=45
17y = 45 - 11
17y= 34 /:17
y=2
{x=1
{y=2
c){8a+9b=36
{a-16b=210 /*-8
{8a+9b=36
{-8a + 128b = -1680
---------------------------- +
8a+9b-8a+128b = 36 - 1680
137b= -1644 /:137
b=-12
a-16 *-12 =210
a + 192 = 210
a=210-192
a=18
{a=18
{b=-12
a)12a-7b=-16/*(-3)
a-3b=-69/*(7)
-36a+21b=48
7a-21b=483
-29a=-435
a=15
180-7b=-16
-7b=-16-180
-7b=196/:7
b=28
b)11x+17y=45
13x+y=15/*(-17)
11x+17y=45
-221x-17y=-255
-210x=-210/:210
x=1
11x+17y=45
11+17y=45
17y=45-11
17y=34/:17
y=2
c)8a+9b=36
a-16b=210/*(-8)
8a+9b=36
-8a+128b=-1680
137b=-1644/:137
b=-12
8a-108=36
8a=36+108
8a=72/:8
a=9
