Evaluate expressions and intro to relations
Name:
Use PEMDAS to evaluate each expression below.
1) If
3) If
5) If
x  3 , evaluate x 2  6 x
x  10 , evaluate 2  x
x  10 , evaluate x  2  x
2) If
x  2 , evaluate x 2  6 x
x
1
x
2
4) If
x  16 , evaluate
6) If
x
3
x  2 , evaluate  3 x 
6
x
Instead of evaluating expressions we’re now going to work with equations, but the process is basically the
same. Given an input (x), find its partner output (y). All the equations below are called relations since they set
up a relationship between one variable (x) and another variable (y).
7) If
y  2 x  3 , find the y partner for each x given.
a) find y when x = -6
b) find y when x = 0
c) find y when x = 0.5
8) Find
9) Find
y when x  3 and
y  x2  4x
y when x  2 and
y  7  3x  27  x 
x
2