# How to Plot 3 Lines

## Contents

## Consider the following linear system

disp('x + 2y = 1') disp('2x + y = 2') disp('3x - 3y = 3')

x + 2y = 1 2x + y = 2 3x - 3y = 3

## Define a range of x values

x = -10:10;

## Solve for

y1 = -.5*x + .5; y2 = -2*x + 2; y3 = 3*x - 3;

## Plot the three lines in three colors

plot(x,y1,'r',x,y2,'b',x,y3,'g')