Please help!! I keep getting crazy fractions for the one for equation of a line and for the other one I have no idea how to solve. I'll be eternally grateful!

Please help I keep getting crazy fractions for the one for equation of a line and for the other one I have no idea how to solve Ill be eternally grateful class=
Please help I keep getting crazy fractions for the one for equation of a line and for the other one I have no idea how to solve Ill be eternally grateful class=