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-10x-8y=-20
20x+16y=4

Sagot :

Luanaidn
[tex] \left \{ {{-10x-8y=-20\ \ \ |\cdot2} \atop {20x+16y=4}} \right. \\\\ \left \{ {{-20x-16y=-40} \atop {20x+16y=4}} \right. \\+-------\\\\0\neq-36\\\\There\ are\ no\ solution.[/tex]
Meli25idn
solving for y:

20x + 16y = 4                    20(1/5 - 4/5y) + 16y = 4
       - 16y    -16y                  4 - 16y +16y = 4
20x = 4- 16y                              (-16y + 16y cancel out)
        20                                        4=4
x = 2/10- 4/5y                              infinite solution

10x - 8y = 20                          10(2/1 +4/5y) - 8y =20
     +8y    +8y                             20 + 8y - 8y = 20
   10x = 20 + 8y                                 (8y - 8y cancels out)
           10                                         20 = 20
x = 2/1 + 4/5y                                     infinite solution
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