Ответ:
1.
x-y = -3
2x-y = -1
x = y-3
2(y-3)-y = -1
2y-6-y = -1
y = 5
x = 5-3 = 2
точка пересечения (2; 5)
2.
-x = y
3x-y = 4
3x+x = 4
4x = 4
x = 1
y = -1
точка пересечения (1; -1)
1.
x = [tex]\sqrt{4}[/tex]
x = 2
x = -2
2.
x = 0
3.
[tex]x^{2}[/tex]-x-6 = 0
[tex]x^{2}[/tex]+2x-3x-6 = 0
x(x+2) - 3(x+2) = 0
(x+2)(x-3) = 0
x+2 = 0 или (x-3) = 0
x = -2 x = 3
4.
-[tex]x^{2}[/tex]-x+2 = 0
[tex]x^{2}[/tex]+x-2 = 0
[tex]x^{2}[/tex]+2x-x-2 = 0
x(x+2) - (x+2) = 0
(x+2)(x-1) = 0
x+2 = 0 или x-1 = 0
x = -2 x = 1