Evaluating Expressions and Equations

+ & - expressions

100

x + 5 + 3 when x = 4

12

200

9 - y + 2 when y = 8

3

300

6 + 6 - 4 + m when m = 3

11

400

x - 5 + u - 2 when x = 10 and u = 9

12

500

t + n - e + m when t = 4, n = 6, e = 1 and m = 0

9

x & / expressions

100

Y x 9 x 2 when Y = 2

36

200

H x 8 x 5 when H = 1

40

300

6 / 2 x J when J = 6

18

400

N / 10 x 2 x N when N = 15

45

500

A / 2 / A when A = 10

1/2

+ & - equations

100

x + 5 = 10

x = 5

200

k - 8 = 11

k = 19

300

c + 3 + 2 = -5

c = -10

400

u + 3 - 3 = 33 

u = 33

500

-b - 7 - 2 = 31

b = -40

x & / equations

100

2h - 9 = 2

h = 5.5

200

u/2 + 5 = 2

u = -6

300

6y + 5 = -19

y = -4

400

j/5= 9 x 2

j = 90

500

5m - 2 = 12

m = 2.8

Surprise

100

What is an equation?

a statement that the values of two mathematical expressions are equal (indicated by the sign =).

200

What is another word for equation?

mathematical statement

300

What is an expression?

 a combination of numbers, variables, functions

400

What is another word for expression?

math operation

500

8m + 3m - 5 = 22

m = 2.45