Question

3x+2y=10
-3x+3y=5
alguém pode me ajudar a fazer esse cálculo?

Answer 1

$\left \{ {{3x+2y=10} \atop {-3x+3y=5\:}} \right. \\\\0x+5y=15\\5y=15\\y=15\div 5\\\bold{y=3}\\\\3x+2y=10\\3x+\left(2\cdot 3\right)=10\\3x+6=10\\3x=10-6\\3x=4\\\bold{x=\dfrac{4}{3}}\\\\\boxed{\bold{S=\left\{\frac{4}{3},\:3\right\}}}$