Passes through (1,-5) and is perpendicular to 3x-y=-5 in slope-intercept form

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

If given an equation of a line such as -1/2x+6 how would you create an equation of a line parallel and perpendicula to this line that goes through another point such as (4,10)

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?