Algebra: substitution

If x = 3,

calculate x + 3

• 3x

• 6

• 6x

• 3

if x = 4,

calculate 2x + 5

• 9

• 13

• 13x

• 8x + 5

if y = 5,

Calculate 2(y - 3)

• 4

• 18

• 10y - 6

• 10y - 3

let t = 20,

calculate t(3 + 2t)

• 860t

• 60 + 40t

• 1000

• 860

let x = 4 and y = 7,

Calculate x + 2y

• 15

• 4 + 14y

• 18

• x + 14

let x = 6 and y = 3,

calculate 3x - 4y

• 18x - 12y

• 6(x - y)

• 12

• 6

let a = 10 and b = -4,

calculate 2a + 4b

• 36

• 4

• -4

• 28

let c = -5 and d = -2,

calculate 3( 2c - d)

• -24

• -36

• 36

• 24

let a = 4, b = 6 and c = -2,

calculate 4a + 2b - 3c

• 24

• 14

• 26

• 12

let x = -4, y = 4, z = 2

calculate 3x - 2(2y - 2z)

• 20

• 4

• -20

• -4