Words & Expression
Write an expression that shows a number decreased by 5.
c - 5
n = 3 .... n x 12 =
36
p + 3 + 7
p = 4
3x + 4x
7x
What is a variable?
A letter or symbol that represents an unknown number.
Write an expression that shows a number multiplied by 6.
c x 6
r = 6 ..... r - 2 x 2 =
2
p/2 = 2
p = 4
2a + 3b + 4a
6a + 3b
Translate into an algebraic expression:
“Five more than twice a number.”
2x + 5
Write an expression that shows a number multiplied by 3.
c x 3
p = 2 ..... p/4
p + 7 x 2 = 20
p = 6
5y – 2y + 8
3y + 8
Evaluate when a = 3 and b = 2:
4a + b
4(3) + 2 = 14
Write an expression that shows a number divided by 5 then decreased by 2.
c/5 - 2
p = 2 and m = 4 .... p x 2m
16
p x 14 = 7
p = 0.5
3(2x + 4) + x
7x + 12
Simplify 3(2x – 1) + 4x
6x – 3 + 4x =
10x – 3
Write an expression that shows 9 times a number then increased by 5 then decreased by 2.
9c + 5 - 2
g=3 and t=6 ..... g/t x 6
3
p + 4 x 3 = 22
p = 10
4(3m – 2) – 2(2m – 5)
8m + 2
Solve for x
2(x + 4) = 3x – 5
x = 13