How can i put (4,1) and a slope of -1 into an equation?

Given abcd ac=38 and ae=3x+4 find the value of x

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.