For each of the following, tell whether the expressions are equivalent expressions or not equivalent expressions. TY <3
 1. 16b + 7a - c and 7a + (-c) + 16b
 Equivalent expressions or not equivalent expressions?
 2. 5y + (-4) and 4 + (-5y)
 Equivalent expressions or not equivalent expressions?
 3. x + x + 3 - y + 2x - 1 + 6y and 4x + 5y + 2 
 Equivalent expressions or not equivalent expressions?