What similarities and differences might there be between functions and linear equations? Are all linear equations functions?
1) Graph these functions using a graphing calculator or program:
f(x) = x^2 + 5
g(x) = 2x + 5
h(x)= x^3 + 5
What similarities and differences can you see among them?
2) Given the above functions, do you think that all linear equations can be expressed as functions?