Graph y = 4x - 9 on a graph
To graph a linear function we have to find at least two points that belong to the function.
Let us take two different values of x.
x = 2
y = 4x - 9
→ 4 × 2 - 9
→ 8-9
→ -1
x = 2 then y = -1
[tex] \rule{40mm}{2pt}[/tex]
x = 3
y = 4x - 9
→ 4 × 3 - 9
→ 12 - 9
→ 3
x = 3 then y = 3
[tex] \rule{40mm}{2pt}[/tex]
Now we can graph these two points on the coordinate axis and join them with a line.
[tex] \rule{60mm}{3pt}[/tex]
