Answer:
Substitution
Step-by-step explanation:
Subtitue x=3 into the second equation
y=2(3)+1
y=6+1
y=7
D the answer for this problem okay
I would say D because if you do 10 x 2 you get 20 then minus 9 equals 11 and that seems around the right measurements
1. False because a rational is a fraction or part of a number (

).

2. True; a real number is any number that isn't imaginary (

)
3. True; same reason
4. True; an integer is any number that can be wrote without a fraction or decimal (the opposite of rational).
5. True;

and that's a decimal.
6. True; the natural number system starts from 0 and counts upwards
7. True; reason above
Answer:
24 ft
Step-by-step explanation:
i took the test and im glad to be of service :)