F(x) = x² - 4x , x0 = 1
f'(x) = 2x - 4
f'(1) = - 2
f(1) = - 3
y = f'(x0)(x - x0) + f(x0) = -2(x - 1) - 3 = -2x + 2 - 3 = -2x - 1
y = -2x - 1
<span>{3х+у=5
{4+2у=х
3*(4+2y)+y=5
12+6y+y=5
7y=5-12
7y=-7
y=-1
x=4+2*(-1)=4-2=2
(2;-1) </span><span>координаты точки пересечения прямых 3х+у=5 и 4+2у=х</span>