The equation of a line that is perpendicular to the line y=-7x+4
any line with a slope of 1/7 will be perpendicular to that line, which has a slope of -7.
So, y = 1/7 x + k
will do, no matter what value you choose for k.
So, y = 1/7 x + k
will do, no matter what value you choose for k.