###### Exercise 12

Are the equations below linear equations in one variable?

\(-5-4y^{2}=-21\)

is

is not

\(\sqrt{1-4.7x}=2\)

is

is not

\(9q-y^{2}=1\)

is

is not

\(2\pi r=12\pi\)

is

is not

\(-r-11=3\)

is

is not

\(6.6y=6\)

is

is not

Are the equations below linear equations in one variable?

\(-5-4y^{2}=-21\)

is

is not

\(\sqrt{1-4.7x}=2\)

is

is not

\(9q-y^{2}=1\)

is

is not

\(2\pi r=12\pi\)

is

is not

\(-r-11=3\)

is

is not

\(6.6y=6\)

is

is not