Question

Ryan made a graph to show how his age compared to his cat's age:

https://cdn.kastatic.org/ka-perseus-graphie/064c0e31501cc204d854579b7068936262a66449.svg
When Ryan is 20 years old, how old will his cat be?

Answer 1

Khan academy

Explanation:

Let's use the graph to think about the difference between Ryan's age and his cat's age. That will help us think of an equation we can use to find how old Ryan's cat will be when Ryan is 20 years old.

DIFFERENCE IN AGES AND EQUATION

Ryan's age 6 8 10

\Maroon {↓−5start color #9e034e, minus, 5, end color #9e034e \marooned{\downarrow-5} ↓−5start color #9e034e, minus, 5, end color #9e034e \5} ↓−5start color #9e034e, minus, 5, end color #9e034e

Cat's aged 1 3 5

The cat's age is always 5 years less than Ryan's age, so we can write an equation to find the cat's age (c) in terms of Ryan's age (r):
`c=r−5`

IS THERE ANOTHERE EQUATION WE COULD USE

How old is the cat when Ryan is 20?

Let's find the value of c when
`r=20`

`c​ =r−5=20−5=15​`

Answer

When Ryan is 20 years old, his cat will be
`15` years old