Question 350111
{{{x}}} values are values you choose. 
That's the independent variable. 
Then once you choose that, the value of {{{y}}} is determined, it's the dependent variable (dependent on your choice of {{{x}}}).
The y-intercept is the value of {{{y}}} when {{{x=0}}}.
It's the value of the function when it crosses the y-axis.
{{{y=4x-3}}}
{{{y=4(0)-3}}}
{{{y=-3}}}
(0,-3)
.
.
.
Choose any other {{{x}}} value and calculate {{{y}}}. 
Then you'll have two points and you can draw your line.
How about {{{x=2}}}? Again, doesn't matter, it's your choice.
{{{y=4x-3}}}
{{{y=4(2)-3}}}
{{{y=8-3}}}
{{{y=5}}}
(2,5)
.
.
.
Now plot the points and connect them with a line.
.
.
.
{{{drawing(300,300,-8,8,-8,8,grid(1),circle(2,5,0.3),circle(0,-3,0.3),graph(300,300,-8,8,-8,8,4x-3))}}}