Mathematics: X+y=0 3x−2y=10 which of the following ordered pairs (x, y) satisfies the system of equations above?

X+y=0 3x−2y=10 which of the following ordered pairs

Ответ:

Yasminl52899

29.07.2019

Try this option (it is only one way): $\left \{ {{x+y=0} \atop {3x-2y=10}} \right. \ =\ \textgreater \ (1) \ \left \{ {{2x+2y=0} \atop {3x-2y=10}} \right. \ =\ \textgreater \ (2) \ \left \{ {{5x=10} \atop {2x+2y=0}} \right. \ =\ \textgreater \ \ \left \{ {{y=-2} \atop {x=2}} \right.$ note, that (1) means 2(x+y)=0*2, (2) means 2x+2y+3x-2y=10.answer: (2; -2)