Algebraic expressions is very useful in finding the unknown value of something that you want to know.
Getting the price of a sale product
Sample problem:
If Neri paid 500 pesos for the watch which is 20% off. Find the original prize of the watch.
Solution:
Let x be the original price.
500 + 500(20%) = x
500 + 500(0.2) = x
500 + 100 = x
600 = x
Hence, the original price of the watch is 600 pesos.
Finding a distance
Sample problem:
Jake is going to the church but before that, he went to a friend's house whose 7 km away from his house. If the total distance that he'd travel is 20 km, what is the distance travelled between the church and his friends'?
Solution:
Let x be the distance travelled from church to his friends'
x + 7 = 20
x = 20 - 7
x = 13
Hence, Jake would travel a total of 13 km from his friend's house to go to the church.
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Verified answer
USES OF ALGEBRAIC EXPRESSIONS
Algebraic expressions is very useful in finding the unknown value of something that you want to know.
Getting the price of a sale product
Sample problem:
If Neri paid 500 pesos for the watch which is 20% off. Find the original prize of the watch.
Solution:
Let x be the original price.
500 + 500(20%) = x
500 + 500(0.2) = x
500 + 100 = x
600 = x
Hence, the original price of the watch is 600 pesos.
Finding a distance
Sample problem:
Jake is going to the church but before that, he went to a friend's house whose 7 km away from his house. If the total distance that he'd travel is 20 km, what is the distance travelled between the church and his friends'?
Solution:
Let x be the distance travelled from church to his friends'
x + 7 = 20
x = 20 - 7
x = 13
Hence, Jake would travel a total of 13 km from his friend's house to go to the church.
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