Before that, I will give you some words to study in case Mr Isfeld asks you what this word means on the Exams.
Variable: A letter that represents an unknown number
For example x,a,n it could be any letter.
Expression: Any single number or variable or combination of operations (+,-,x,/ <-- division) involving numbers and variables.
For example 5,r,8t,x+9, 2y-7.
Value: A known or calculated amount.
Constant: A Number that does not change-increases or decreases the value of an expression.
Numerical Coefficient: A number that multiplies a variable.
Example: 4c+2
Equation: Mathematical Statement with two expressions that have the same value.
Example: x+2=3, y-7+(-4), 3a-2=a+2, b=4
Linear Relation: A pattern made by 2 sets of numbers that results in points along a straight line on a coordinate grid. Example:
Graph: A Visual way to show how two sets of numbers relate to each other. For example:
I might have missed a word. Comment if I did!
Well, On to your questions!
Question 1: a+1=3, What is a? Remember to check your answer.
Question 2: 4c-3=17, What is c? Check your answer!
Question 3: B-2=5, What is B? Check your answer!
Question 4: 2j+1=9, What is J? Check your answer!
Question 5: w/3=6, What is W? (The dash means divided by) Check your answer!
Question 6: f/3-2=1, What is F? Check your answer!
Question 7: 3a-1=23, What is a? Check your answer!
Question 8: f-3=6, What is F? Check your answer!
Question 9: 16(+)x=21, What is x? Check your answer!
Question 10: 21=4+p, What is P? Check your answer!
If you need to check if you are right, you can scroll down to look for how you do it and the answers. Do not cheat and scroll down to look for the answers right away, try your best and think hard first!
Scrolling?
Still Scrolling?
CHEATER! haha, just kidding :)
Answer for Question 1:
A+1=3, yeah, It's an easy question, you guys should have got this right. Here's how you do it! A+1-1=3-1 Whatever you do to the left, you have to do it to the right!
3-1=2, a=2
Check your answer! (re write the question) a+1=3, 2+1=3, 3=3! If you have this, then you are correct!
Answer for Question 2:
4c-3=17, Reverse order of operations: 4c-3+3=17+3
17+3=20
4c/4=20/4
20/4=5
C=5
Check your answer! 4c-3=17, 4(5)-3=17, 17=17.
Answer for Question 3:
B-2=5
B-2+2=5+2
5+2=7
B=7
Check your answer! B-2=5, 7-2=5, 5=5!
Answer for Question 4:
2j+1=9
2j+1-1=9-1
2j/2=8/2
8/2=4
Check your answer! 2j+1=9, 2(4)+1=9, 9=9!
Answer for Question 5:
W/3=6
3 x w/3 =6x3
W=18
Check your answer! W/3=6, 18/3=6, 6=6!
Answer for Question 6:
F/3-2=1
f/3-2+2=1+2
f/3=3x3
f=9
Check your answer! F/3-2=1, 9/3-2=1, 3-2=1, 1=1!
Answer for Question 7:
3a-1=23
3a-1+1=23+1
a/3 = 24/3
a=8
Check your answer! 3a-1=23, 3(8)-1=23, 23=23!
Answer for Question 8:
F-3=6
F-3+3=6+3
F=9
Check your answer! F-3=6, 9-3=6, 6=6!
Answer for Question 9:
16(+)x=21
+16-16(+)x=21=16
x=5
Check your answer! 16(+)x=21, 16+5=21,21=21!
Answer for Question 10:
21=4+p
21-4=+4-4+p
21-4=17
17=p
Check your answer! 21=4+p, 21=4+17, 21=21!
And there you have it!
This actually took me the whole night, I don't know why but I did it all for you guys!(:
I hope this helps you for the exam, sorry if it's too long.. I tried my best!
Here is also a video you can watch to understand more about solving equations if you still don't get it. http://youtu.be/W7fPsSw74TM
Ok, Have a good day! (:
