Lisa's and her dad's ages combined are 51. Her dad's age is 4 less than 4 times her age. How old is Lisa?
1 Answer
Dec 20, 2016
#L=9.4# years
or
Explanation:
Lisa's age:
Dad's age:
Lisa's age and Dad's age combined is 51:
Dad's age is 4 less than 4 times her (Lisa's) age:
You have a value for
Adding like terms,
Add 4 to each side, canceling out the left:
Dividing both sides by 5, canceling out the left:
9.4 years, or