(2,-3 )( -2,5)

**1. y = mx + b** - slope-intercept form linear equation

**2.**

*- standard form of linear equation (A ≥ 0)*

**Ax + By = C****3.**- two-point form

*y - y*_{1}= m(x - x_{2})

**y**_{1}- y_{2 }

**4.**

*m = ————*

**x**_{1}- x_{2}**4.**(x

_{1}, y

_{1}) (x

_{2}, y

_{2})

(2 , -3) (-2 , 5)

-3 - 5 -8 -8

m = ———— = ——— = —— = – 2

2 - (-2) 2 + 2 4

**(3. ---> 1.)**y – y

_{1}= –2(x – x

_{1})

y - (-3) = -2(x - 2) ---> y + 3 = -2x + 4 --->

**y = -2x + 1****2.**y = - 2x + 1 --->

**2x + y = 1**