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# Systems of linear equations word problems — Basic example

Watch Sal work through a basic Systems of linear equations word problem.

## Want to join the conversation?

• hi, wont it be much easier if you just said:
Hazel amount of keys is X, Leo has 4 more keys, means X+4
and the both combined = 18:
X+4+X =18
2X = 18-4
2X=14\:2
X=7
and that's it.
• Bingo. That is also very quick 😉
• you could just do 18-4= 14/2=7
• yea 😂
• Do this:
9=9 (9+9=18)
divide 4 by 2, you get 2. (4 is the difference between the two values)
now add 2 to one side, and subtract 2 from the other.
9+2=9-2
11=7 (11+7=18)
Some of you guys will overthink something as simple as this, read the problem carefully and evaluate what you have learned one by one to successfully get the answer.
Please understand that I'm using the equal signs in a means to separate the two numbers, it holds no weight in this problem.
Good luck in the future!
-Sincerely from the man who will probably score a 600 on tomorrow's SAT.
• Ez pz !
• if L + H=18 take away 4 you get 14 leo=7 Hazel=7 then add the four back to Leo so Leo=11 Hazel=7
• I did this:

L > H
L := H + 4 (L is bigger by H 4 more)

L + H = 18 total keys

(H+4) + H = 18
2H + 4 = 18
• what are equations to be precise?
• You mean the definition of equations?
"In mathematics, an equation is a statement that asserts the equality of two expressions."