When you multiply each value in parentheses by the value on the outside.

2+2

x in
2x>10

y in
3x+10=4y
3x+6=3y

Function or Not a Function
x:1, 2, 3, 4, 5
y:2, 4, 6, 8, 10

The number being multiplied by the variable.

20*2

a in
4a<16

y in
-3y+4x=15
3y+2x=3

Function or Not a Function
x: 1, 2, 3, 5, 3
y: 3, 2, 4, 6, 10,

A number not containing a variable.

40/4

g in
7g<73-10

x in
6x+3y=12
3x-2y=2

Function or Not a Function
x: 2, 3, 4, 3, 2
y: 1, 2, 3, 4, 5

When two values are compared to get a value

(40+10)4

h in
8h>75-4

y in
6y+4x=12
4y-2x=1

Function or Not a Function
x:-2, 3, 4, -3, 2
y:1, 3, 4, 6, 9

When variables take place in an equation and require you to find the value of that variable

√100

x in
√x<11

y in
7x-6y=14
-7x+6y=14

Linear Function, Function, or Not a Function
x: 2, 4, 6, 8
y: 4, 6, 8, 10