If you're solving for y it has to be this way

-7y=-3x+9

Y=3/7x -9/7

If you're solving for x

3x=7y+9

X=3/7y+3/1

-7y=-3x+9

Y=3/7x -9/7

If you're solving for x

3x=7y+9

X=3/7y+3/1

Graph. red• 25+0.5d (music city)

blue•. 1.5d

Music city

C=25+0.5d

C-cost

D-downloads

Both are the same cost at 25 downloads

Tune Dune

C=1.5d

Tune Dune is cheaper until the 25 song downloaded, the they are equal. After that, Music city is cheaper.

blue•. 1.5d

Music city

C=25+0.5d

C-cost

D-downloads

Both are the same cost at 25 downloads

Tune Dune

C=1.5d

Tune Dune is cheaper until the 25 song downloaded, the they are equal. After that, Music city is cheaper.

Answer 1.a):

x-intercept= (2,0)

Because graph crosses x-axis at x=2

Answer 1.b):

y-intercept= (0,4)

Because graph crosses y-axis at y=4

Answer 1.c):

Domain= All real numbers.

Because graph covers all x-values along x-axis when checking from left side to right side.

Answer 1.d):

Range = All real numbers.

Because graph covers all y-values along y-axis when checking from bottom side to up side.

Answer 1.e):

Minimum = NO

Answer 1.f):

Maximum = NO

Answer 1.g):

Increasing Interval = NO

Because graph goes all the time downward.

Answer 1.f):

Decreasing Interval = (-infinity, infinity)

Because graph goes all the time downward when looking from -infinity to infinity.

Same way we can solve other problems.

Answer 2.a):

x-intercept= (-1,0), (2,0)

Answer 2.b):

y-intercept= (0,-2)

Answer 2.c):

Domain= All real numbers.

Answer 2.d):

Range = [-2.25, infinity)

Answer 2.e):

Minimum = -2.25

Answer 2.f):

Maximum = NO

Answer 2.g):

Increasing Interval = (0.5, infinity)

Answer 2.f):

Decreasing Interval = (-infinity, 0.5)

Answer 3.a):

x-intercept= (-2,0)

Answer 3.b):

y-intercept= (0,-6)

Answer 3.c):

Domain= All real numbers.

Answer 3.d):

Range = (-infinity, 2)

Answer 3.e):

Minimum = NO

Answer 3.f):

Maximum = NO

Answer 3.g):

Increasing Interval = NO

Answer 3.f):

Decreasing Interval = (-infinity, infinity)

Answer 4.a):

x-intercept= (-4,0), (2,0)

Answer 4.b):

y-intercept= (0,-2)

Answer 4.c):

Domain= All real numbers.

Answer 4.d):

Range = (-3,infinity)

Answer 4.e):

Minimum = -3

Answer 4.f):

Maximum = NO

Answer 4.g):

Increasing Interval = (-1, infinity)

Answer 4.f):

Decreasing Interval = (-infinity, -1)

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