And show your work for a. b. c. and d.

a.

3x + 5y = 15

3x + 5y - 5y = 15 - 5y

3x = 15 - 5y

=

x =

b.

y = mx + b

y - b = mx + b - b

y - b = mx

=

= x

c.

= y

× b = y × b

w - a = yb

=

= b

c.

pV = nrt

=

= t

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!