Equations 1
6 + x = 13
x=7
x/6 = 9
x=54
Zai has 15 stickers. Mr. Ehst gives her more stickers. She now has 57. How many stickers did Mr. Ehst give Zai? Write and solve an equation.
15 + x = 57
x=42
What do we call a letter that stands for an unknown number?
variable
Write an equation that says, "Seven times a number is 52."
7n=52
x - 45 = 162
x=207?
x + 752 = 1000
x = 248
Anabelle is reading a book with 72 pages. She read 34 pages already. How many more pages does Robin have left to read? Write and solve an equation.
34 + x = 72
x=38
When we try to get the variable by itself on one side of an equation, what do we call that?
Isolating the variable
3x + 12 x - 5x = 60
Solve for x.
x=6
0.3x=2.4
x=8
9x = 15
x = 1.666.. or 1 2/3
Jordan has some cookies. He split them evenly among 18 friends. If each friend received 3 cookies, how many cookies did he start with? Write and solve an equation.
x/18=3
x=54
To solve an equation, we use the opposite operations that "undo" each other. We call these _______ operations.
inverse
x/6.7 = 23
What would you do to both sides to solve?
Multiply by 6.7
x/8=2.5
x=20
62.3 = x + 9.7
x=52.6
Aiden was shopping at target. He bought 8 pencils for $2.96. How much was each pencil? Write and solve an equation.
8x=2.96
x=$0.37
In 3x + 4, we call 3 the ________ of x.
Coefficient
35% of what number is 200? Select the equation that could be used to solve.
A. 0.35x = 200
B. x/200=35
C. 35 + x = 200
A. 0.35x = 200
3.5x=32.2
x=9.2
x รท 3/4 = 36
x = 27
Jayden scored 498 points while playing a game. Fawzi scored some points, too. Together they scored 722 points. How many points did Fawzi score?
498 + x = 722
x=224
Constant
7.2 more than a number is 16. What is the number? Write an equation, then solve.
n+7.2=16
n=8.8