Step-by-step explanation:

0.2m^3 = 0.0000002 cm^3
Solve for y in 3x+7=y
y=7−3x
Substitute y=7−3x
y=7−3x into 8x−3y=30
8x−3y=30.
17x−21=30
Solve for x
x in 17x−21=30
17x−21=30.
X=3
Substitute x=3 into y=7−3x
y=-2
Therefore,
x=3
y=−2
Answer:
it's part of the real number system
it's a rational number
it's an integer
Step-by-step explanation: