Alex is 4 years younger than 2 times his sister's age. Write a rule that represents Alex's age x as a function of his sister's a ge y. How old is Alex, if his sister is 11?
2 answers:
Answer:
alex is 18 sis is 11
Step-by-step explanation:
Answer:
y = 2x - 4; Alex is 18.
Step-by-step explanation:
Since Alex is 4 years younger than 2 times his sister's age, and his sister is y and Alex is x, the function of y to x must be y = 2x - 4.
According to the rule, if Alex's sister is 11, Alex is 2 times that minus four. If you calculate that, you get
11 * 2 = 22
22 - 4 = 18
So Alex is 18 if his sister is 11.
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