How to find the percentage that is not shaded on the grid?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Find the solution of each of the following.

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total