##7x-y-64=0##

Equation of a line passing through point ##(x_1,y_1)## and having a ##m## is given by

##(y-y_1)=m(x-x_1)##

Hence equation of line passing through ##(10,6)## and having a slope of ##7## is

##(y-6)=7×(x-10)## or

##y-6=7x-70## or

##7x-y-64=0##