Помогите пожалуйста Максимально подробнее всё распишите ПОЖАЛУЙСТА!!!

$1-1) y = 4x-8; x_1 = -3; x_2 = 0; x_3 = 1; x_4 = 6\\x_1 = 3; y_1 = 4*(-3) - 8 = -20;\\x_2 = 0; y_2 = 4*0 - 8 = -8\\x_3 = 1; y_3 = 4*1-8 = -4\\x_4 = 6; y_4 = 4*6-8 = 16\\1-2)y = -\frac x3 -1; x_1 = -6; x_2 = -1; x_3 = 0; x_4 = 1.5\\x_1 = -6; y_1 = -\frac{-6}3 - 1 = 1\\x_2 = -1; y_2 = -\frac{-1}3 - 1 = -\frac23\\x_3 = 0; y_3 = -\frac03-1 = -1\\x_4 = 1.5; y_4 = -\frac{1.5}3 - 1 = -1.5\\1-3) y = x^2; x_1=-3;x_2 = 0;x_3=3; y_4 = 4.5\\x_1 = -3; y_1 = (-3)^2 = 9\\x_2 =0; y_2 = 0^2 = 0\\$ $x_3 = 3; y_3 = 3^2 = 9\\x_4 = 4.5; y_4 = 4.5^2 = 20.25\\1-3) y = 0.8-0.4x; x_1 = -1; x_2 = 0; x_3 = 1; x_4 = 2; x_5 = 3\\y_1 = 0.8-0.4*(-1) = 1.2; y_2 = 0.8 - 0.4*0 = 0.8;\\y_3 = 0.8 - 0.4*1 = 0.4; y_4 = 0.8-0.4*2 = 0. y_5 = 0.8-0.4*3 = -0.4\\\left[\begin{array}{cccccc}x&-1&0&1&2&3\\y&1.2&0.8&0.4&0&-0.4\end{array}\right]$

y = 0, если x = 2; x = 0, если y = 0.8

$3-1)y = -2.5x; y = 12\\12 = -2.5x\\x = -4.8\\3-2) y = 4x + 3, y = \frac23\\\frac23 = 4x + 3\\-\frac73 = 4x\\x = -\frac7{12}$