Bună!
(❁´◡`❁)
a)
[tex]\left \{ {{\frac{x}{y}=\frac{3}{4} } \atop {5x-4y=-3}} \right. => \left \{ {{y=\frac{4x}{3} } \atop {5x-4y=-3}} \right. => 5x-4*\frac{4x}{3} =-3/*3 => 15x-16x=-9 =>[/tex]
[tex]=> x=9\\=> y=\frac4*9x}{3} =4*3=> y=12[/tex]
(x, y)=(9, 12)
b)
[tex]\left \{ {{2x-y=5} \atop {3x+y=10}} \right.[/tex]
_______(+)
5x+ / =15/:5 => x=3
2x-y=5 <=> 2×3-y=5 => -y=5-6 => y=1
(x, y)=(3, 1)
