How do you find the values by substituting numbers for variables?

Answer 1

Example: A + B = C. Here is a formula with 3 variables and an operation (addition).

Word problem using the example: There are 2 dogs: One dog eats 2 snacks and the other dog eats 5 snacks. What is the total number of the snacks eaten by the 2 dogs?

Let the first dogs snacks be represented by the variable A and let the second dogs snacks be represented by the variable B., and the total number of snacks eaten by the 2 dogs be represented by the variable C.

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A (The first dogs snacks.) + B (The second dogs snacks.) = C ( The total number of snacks eaten by the 2 dogs.) 2 snacks eaten + 5 snacks eaten = 7 snacks eaten. . A + B = C, A = 2, B = 5, 2 + 5 = 7, C = 7.

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If you knew the total snacks eaten and also knew the number of snacks eaten by one dog, your equation would look something like this.

C(Total snacks eaten), A( first dogs snacks), B(second dogs snacks. unknown.)

A + B = C, 2 + B = 7, B = [ 7 - 2], B = 5.