rewrite 3x + 4y = 10 in function notation
3x+4y=10
subtract 3x from both sides
4y=-3x+10
then divide 4 for on both sides, including the -3x and 10
then you should get y=-3/4x + 10/4
simplify
y=-3/4x + 5/2
your final answer should be f(x) -3/4x + 5/2