We only know the value of <span>f(5)</span>
therefore we need to figure out what we would put in for x in <span>f(<span>1/3 </span>x)</span> to get 5
set
<span><span>1/3 </span>x=5</span><span>x=15 </span>now if <span>x= 15</span> then <span>f(<span>1/3 </span>x) = f(<span>1/3</span>×15) = f(5)=8 </span><span>and so </span><span><span>1/4</span>×8−2=2−1=1
</span>therefore the "corresponding point" is <span><span>(15,1)</span></span>
