Addition (+)
equations
equations
a + 3 = 8
a = 5
g - 5 = 4
g = 9
What is the inverse (opposite) operation of addition?
Subtraction
5k = 25
k = 5
v/9 = 9
v = 81
x + 80 = 120
x = 40
n - 10 = 13
n = 23
Define inverse operation
The opposite, signs that undo each other
25u = 625
u = 25
t/-7 = 4
t = -28
h + 66= 21
h = -45
f - 21 = 98
f = 119
Things that have an effect on one another, represented in a equations by a letter.
Variable
486 = -18c
c = -27
-4 = y/10
y = -40
120 = j + 30
j =90
a - 15 = -15
s = 0
Name the 4 operations
addition, subtraction, multiplication, division
12y = -144
y = -12
i/-12 = -4
i = 48
p + (-12) = 86
p = 98
28 = z - 48
z = 76
Replacing a variable with a number value
Substitution
-8x = 56
-7
-7 = b/-12
b = 84