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What is x-2y=0 and then also 2x-5y=-4

Sagot :

[tex]x-2y=0\:/(-2) \\ 2x-5y=-4 \\ \\ =>-2x+4y=0 \\ 2x+-5y=-4 \\ \\ =>-y=-4 \\ y=4 \\ \\ x-2.4=0 \\ =>x-8=0 \\ x=8 \\ \\ \framebox[1.1\width]{Good Luck!} \par[/tex]
 x + 2y = 0   ⇒ 2x + 4y = 0
2x - 5y = -4 ⇒ 2x - 5y = -4
                               9y = 4
                                9     9
                                 y = 4/9
                    x + 2(4/9) = 0
                        x + 8/9 = 0
                             -8/9  -8/9
                                 x = -8/9
                           (x, y) = (-8/9, 4/9)