Question

Susan is 5 years older than her sister. The sum of their ages is 51. Define a variable. Then write an equation that could be used to find their ages.

Answer 1

Answer:

$x+x+5 = 51$

Step-by-step explanation:

Let the age of Susan be = $x$

And, let the age of her older sister be = $x+5$

The sum of their ages = $x+x+5 = 51$

$2x = 46$

$x = \frac{46}{2}= 23$

Answer 2

Variable is a number that can change throughout the solution solving process .

let age of sister x

x+5+x=51

2x+5=51