How do i write an equation for y being the cost of shipping a package and x is weight of pounds

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

If chord ab is congruent to chord cd, then what must be true about ef and eg?