For this case we have that by definition, the slope of a line is given by:
[tex]m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}}[/tex]
Where:
[tex](x_ {1}, y_ {1})\\(x_ {2}, y_ {2})[/tex]
They are two points through which the line passes.
According to the statement we have two points:
[tex](x_ {1}, y_ {1}) :( 1,3)\\(x_ {2}, y_ {2}) :( 4,7)[/tex]
Substituting we have:
[tex]m = \frac {7-3} {4-1} = \frac {4} {3}[/tex]
Thus, the slope of the line is:
[tex]\frac {4} {3}[/tex]
Answer:
[tex]\frac {4} {3}[/tex]