Răspuns:
1. 8x+4y=9 |*(-2)
10x+8y=-4
=> -16x-8y=-18
10x+8y=-4
=> -6x=-22
[tex] = \frac{11}{3} [/tex]
8x+4y=-18
[tex] \frac{88}{ 3} + 4y = 9[/tex]
[tex]4y = - \frac{61}{3} [/tex]
[tex]y = - \frac{61}{12} [/tex]
2. -6p-4q= -6
-3p-2q= -8 | *(-2)
=> -6p-4q=-6
6p+4q=16
=> p, q aparțin mulțimii vide
3. 4a-9b= -6 |* 3
3a-4b= 2 |* (-4)
=> 12a-27b= - 18
-12a+16b= - 8
=> -11b= -26
[tex]b = \frac{26}{11} [/tex]
[tex]3a = 2 + \frac{104}{11} [/tex]
[tex]3a = \frac{126}{11} [/tex]
[tex]a = \frac{42}{11} [/tex]
Sper că te-am ajutat! ✨
