Vocabulary
A letter in math that represents an unknown number
Example: x, y, z
variable
x+7=19
x=12
x=3
Kevin and Theo are playing basketball. Their total scores are 70 points. Kevin scored 32 points. How many points did Theo score?
Write an equation and solve.
t + 32 = 70
t=38 points
A statement that two math expressions are equal
Equation
x - 76 = 89
x=165
x/5+9=21
x=60
Jordan is helping stack wood in the yard. He stacks 89 logs. He later adds wood to the fire pit. He now has 63 unused logs. How many logs did he burn in the fire pit?
l + 63 = 89
l=26 logs
A value of a number that never changes; it is always the same
Example: 4, 7, -200, 99999
Constant number
-9x=243
x=-27
-10 - 4x = 22
x=-8
Nevaeh is selling her art. She sells his canvas for $50 and her remaining sketches for $8 each. She has made $146. How many sketches did she make?
Write an equation and solve.
50 + 8s = 146.
s=12; 12 sketches
Operations that are opposite of each other;
such as add/subtract & multiply/divide
x/15=6
x=90
6 + x/3 = 11
x=15
Yu-Ting is stopping by the store to get breakfast. She buys a coffee for $8 and spends the rest on bagels for $1.50 each. How many bagels did she buy if she spent $17?
8 +1.50b=17
b=9; 9 bagels
What is a number multiplied by the variable called?
Example: 4x, 9y, -10z
Coefficient
-13x = -325
x=25
(7+x)/(3)=5
x=8
Mio is visiting the movie theater this evening. She brings a $20 bill with her and spends all of it. She buys his ticket for $9 and buys 4 candy boxes. How much does each candy box cost?
Write an equation and solve.
9 + 4c = 20
c=$2.75