Question

Plot a line graph for the variable $x$ and $y$, where $y=2x+1$.
Using the graph, find the value of (i) $y$, when $x=5$ and (ii) $x$, when $y=13$.

Answer 1

$atx=5,y=(2\times 5)+1=11ify=13,then13=2x+12x=12\therefore x=6$