Explanation:
that is totally easy.
in the slope intercept form of a line equation the factor of x is always the slope.
in general
y = ax + b
a = the slope.
so, in our case here
y = 5x - 7
5 is the slope.
and -7 is the y intercept (at what point does the line intercept the y-axis; that is the y value when x = 0).