y=x2-4x+3
5x+y=5
y=5 - 5x
5 - 5x = x2 - 4x + 3
x2 + x - 2 = 0
D = 1 + 8 = 3
x12 = (-1 ± 3)/2 = -2, 1
x1 = -2
y = 5 - 5*(-2) = 15
x2 = 1
y = 5 - 5 = 0
ответ (1, 0) (-2, 15)
10-4(2x+5)=6y-13
4y-63=5(4x-2y)+2
4y-63-20x+10y-2=0
14y-65-20x=0
x=0.7y-3.25
3-8x-6y=0
3-8*(0.7y-3.25)-6y=0
3-5.6y+26-6y=0
29-11.6y=0
y=29/11.6y=2.пятых
14*2.5-65-20x=0
-30-20x=0
x=-30/20
x=-1.5
y=x2-4x+3
5x+y=5
y=x2-4x+3
y=5 - 5x
5 - 5x = x2 - 4x + 3
x2 + x - 2 = 0
D = 1 + 8 = 3
x12 = (-1 ± 3)/2 = -2, 1
x1 = -2
y = 5 - 5*(-2) = 15
x2 = 1
y = 5 - 5 = 0
ответ (1, 0) (-2, 15)