How many solutions are in -5=-5

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

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Determine which solution is correct for solving 5/7y=6 reciprocals.