I believe you left the x out of the equation, and it should read y=-5/7x+2. Since it is in slope-intercept form, we can use it to find the slope of our line. Our line is parallel, so it will have the same slope, -5/7. Since we are given a point on our line, we can use the point-slope form to find the equation of our line.
(y-y1)=m(x-x1)
(y--2)=-5/7(x--7)
y+2=-5/7x-5
y=-5/7x-7
Put the point into this equation to see if it works.