Aprēķins: 7xc7x8 - 1

(y-y1)

/ (y2-y1)

(x-x1)

/ (x2-x1)

(y-y1)

/ (y2-y1)

(x-x1)

/ (x2-x1)

$\frac{y-y1}{y2-y1}$ = $\frac{x-x1}{x2-x1}$

(y-y1)

/ (y2-y1)

/ (x2-x1)

$\frac{y-y1}{y2-y1}$ = $\frac{x}{x2-x1}-\frac{x1}{x2-x1}$

(y-y1) = (

/ (x2-x1)

)* (y2-y1) $(y-y1)$ = $(\frac{x}{x2-x1}-\frac{x1}{x2-x1})\cdot (y2-y1)$

y-y1 = (

/ (x2-x1)

)* (y2-y1) $y-y1$ = $(\frac{x}{x2-x1}-\frac{x1}{x2-x1})\cdot (y2-y1)$

y = (

/ (x2-x1)

)* (y2-y1)+y1 $y$ = $(\frac{x}{x2-x1}-\frac{x1}{x2-x1})\cdot (y2-y1)+y1$

y =

y2* x

/ (x2-x1)

y2* x1

/ (x2-x1)

y1* x

/ (x2-x1)

y1* x1

/ (x2-x1)

+y1 $y$ = $\frac{y2\cdot x}{x2-x1}-\frac{y2\cdot x1}{x2-x1}-\frac{y1\cdot x}{x2-x1}+\frac{y1\cdot x1}{x2-x1}+y1$

y =

x* y2

/ (x2-x1)

x1* y2

/ (x2-x1)

x* y1

/ (x2-x1)

x1* y1

/ (x2-x1)

+y1 $y$ = $\frac{x\cdot y2}{x2-x1}-\frac{x1\cdot y2}{x2-x1}-\frac{x\cdot y1}{x2-x1}+\frac{x1\cdot y1}{x2-x1}+y1$