Find the equation of the line through a point (4,-7) and perpendicular to the line whose equation is x-2y=3. Leave the answer in the slope-intercept...

Find the equation of the line through a point (4,-7) and perpendicular to the line whose equation is x-2y=3. Leave the answer in the slope-intercept form.

I need to know how to do something like this so I changed the numbers a bit. Can someone help me solve this so I can learn the steps? Thank you