n.a. <br/><br/>
UNIT M7:  Equations of straight lines/ 

 - London  Heinemann Educational Books  1979 
 - 227p.  ills. 
<br/><br/><label>ISBN: </label>0435509268 
<br/><br/><label>LC Class. No.: </label>QA43  / .C33 1979