Question

Rachel's age is 4 years less than 2 times her brother's age. Rachel's age is 8 minus her

brother's age. How old is Rachel's brother?

Answer 1

Rachel’s age is x.
Her brother’s age is y.

x=2y-4=8-y

Solving this results in (x,y)=(4,4), which are coordinates.
These coordinated mean x (Rachel’s age) is 4, and y (her brother’s age) is also 4.

=Rachel’s brother is 4.

Answer 2

3 or 13? i think

Explanation: