topic 2 : LINEAR EQUATIONS & FUNCTION_1

topic 2 : LINEAR EQUATIONS & FUNCTION_1

1. 2.4 INTERSECTION OF STRAIGHT LINES

   • -point of intersection of two straight line
   • L1 : y=m1x+b1 and L2 : y=m2x+b2

2. 2.5 PARALLEL & PERPENDICULAR LINES

   • L1 and L2 are parallel if m1=m2
   • L1 and L2 are perpendicular if m1x m2 =-1

3. 2.6 PIECEWISE LINEAR FUNCTION

   • -define by more than one rule
   • y = f(x)= {x if x < 0 , 2x+1 if x > 0}
   • y=g(x) = { x + 1 if x <-2 , 2 if -2 < x < 0 , x-1 if x > 0 }

4. 2.7 APPLICATION IN BUSINESS & FINANCE

   • linear equation play in important role in the quantitative analysis of business & economic problems
   • y = mx+c