This is my evidence to show that I’ve achieved my math goal of learning and mastering variables & expressions. My math goal was to find out how to use variables in an accurate way, and also understand outcomes of expressions.
ᴡʜᴀᴛ ᴀʀᴇ ᴠᴀʀɪᴀʙʟᴇs ᴀɴᴅ ᴇxᴘʀᴇssɪᴏɴ??
So I’ll break it down by words:
A symbol or letter to represent anything, like a b c x or just basically anything. Example:
The amount of tickets sold times the cost of the ticket is the money that you earned. Each ticket costs 5$, but you don’t know how much tickets you sold yet. So instead you can write it in a term like this: 5y SO that we know the amount of tickets sold time by the actual cost of each ticket will equal to the money you earned. That is 5 x y, but instead we write it as 5y because the multiplication sign is really confusing and can be misunderstanding by the X sign.
Expressions are is similar to an equation, but instead it does not have an equal sign. These are the examples of expressions: y ÷ 5 6 +7 And a non example is 6 x 4 = 10 because it would’ve been an equation cause there’s an equal sign.
So they are both vocabularies and little parts of algebra. Here are more vocabularies related to expressions and Variables.
Terms are an expression inside either a bigger expression or an equation. Here’s a statement for example:
5 • y + 6 ÷x + 7w
SO that means there are 3 terms in this expressions and 3 little different parts in this expression.
Coefficients are numbers next to a variable, just like 5 in 5y. And like 9 in 9x. And just a number next to any variable. So if they ask you to find the coefficient in this expression:
6y + 7 ÷ 4
The answer would be 6, ‘cause it is a number right next to the variable and would’ve been the coefficient
ʀᴇᴀʟ ʟɪғᴇ ᴇxᴀᴍᴘʟᴇs
We would need expressions and variables while calculating the total costs of money or amounts. Like if we tried to figure out how much all the boxes we need to find out how much boxes there are, and how much each weighs. So if each box weighs 6 kg. But we don’t know how much boxes there are. INstead we can replace it with a variable aka a letter or symbols like y. Then it’ll be 6y
Here is how I improved and learned this
As you can see I learnt so much more other skills and levele dup on khanacademy
Thx for reading!!!!!!