[tex]\displaystyle\bf\\If~p=-8.4~and~q=3.2~find~r~when~r= 8.4q-p\\\\Solution: \\\\r= 8.4q-p=\\\\= 8.4\times3.2-(-8.4)=\\\\= 8.4\times3.2+8.4=\\\\= 26.88+8.4=35.28\\\\\boxed{\bf r=35.28}[/tex]
