Question

Draw the graph of equation `x/(4) + y/(5) = 1` Use the graph drawn to find:
(i) x₁, the value of x, when y = 10
(ii) y₁, the value of y, when x = 8.

Answer 1

First, prepare a table as follows:

X	-1	0	1
Y	`(25)/(4)`	5	`(15)/(4)`

The graph of the equation can be drawn as follows:

From the graph, it can be verified that:
for y = 10, the value of x = - 4.
for x = 8 the value of y = - 5.