Question

Solve the following equations using graphical method.
$x+y=6$
$x-y=4$

Answer 1

Given: (1) $x+y=6$
$\therefore y=6-x$

$x$ =	$1$	$2$	$3$
$y$ =	$5$	$4$	$3$
$(x,y)$	= $(1,5)$	$(2,4)$	$(3,3)$

(2) $x-y=4$
$\therefore y=x-4$

$x$ =	$1$	$2$	$3$
$y$ =	$-3$	$-2$	$-1$
$(x,y)$ =	$(1,-3)$	$(2,-2)$	$(3,-1)$

From the graph, it can be seen clearly that $(x,y)=(5,1)$ is the solution to the pair of simultaneous equations