match the vocabulary to the part of expression below
[tex]5 \times + 3y + 8 + x - 7[/tex]
1. __ variabless. a. 5, 3, 1

2. __ constants. b. 8, -7

3. __coefficients. c. 5×, 3y, -7

d. 5,3,-7

e. x, y ​