Question

Answer 1

a: \(x_{M}+y_{M}=0\)

=>\(y_{M}=-x_{M}\)

Thay y=-x vào y=3x, ta được:

3x=-x

=>4x=0

=>x=0

=>\(y_{M}=-0=0\)

=>M(0;0)

b: \(x_{M}+2\cdot y_{M}=-14\)

=>\(x_{M}=-2\cdot y_{M}-14\)

\(y=3x\)

=>\(y=3\left(-2x-14\right)=-6x-42\)

=>7x=-42

=>x=-6

=>\(y=3\cdot\left(-6\right)=-18\)

=>M(-6;-18)

c: 3x-2y=9

y=3x

Do đó: \(3x-2\cdot3x=9\)

=>-3x=9

=>x=-3

=>y=3*(-3)=-9

=>M(-3;-9)