we have
Real world example
A pounds of banana cost $1.50
what is the cost of 6.5 pounds
Let
x -----> number of pounds
y -----> the total cost
the linear equation is
y=1.50x
so
the pattern is the equation of a line
see the attached figure
For x=6.5 pounds
substitute
y=1.5*(6.5)
y=$9.75
Compare the result of the equation with the graph
the result is the same