Marking brainlest i do not have the graph bc my computer isnt working correctly so if you can do it without the grpah do or write your email below & i will send it to you via there !
chelsea and zack are both dog sitters. chelsea charges $2 per day plus a sign-up fee of $3. zack charges a flat rate of $3 per day.

the system of linear equations below represents y, the total amount earned in dollars for x days of dog sitting.
(3 points
write the equation to represent chelsea’s fees. write the equation to represent zack’s fees. after how many days do chelsea and zack earn the same amount for dog sitting? what is that amount?

Submarines control how much they float or sink in the ocean by changing the volume of air and water contained in large ballast tanks. when the tanks are completely full of water, the submarine increases its overall mass and sinks down to the bottom. when the tanks are completely full of air, the submarine reduces its overall mass and floats to the surface. depending on the density of the seawater surrounding the submarine, it will pump seawater in or out of the tanks in order to achieve the same overall density as the sea water and float neutrally in the water. the volume of the submarine never changes. when the tanks are completely full of water, a submarine with a volume of 7.8\times10^3\text{ m}^37.8×10 3 m 3 7, point, 8, times, 10, start superscript, 3, end superscript, space, m, start superscript, 3, end superscript has a total mass of 8\times10^6\text{ kg}8×10 6 kg8, times, 10, start superscript, 6, end superscript, space, k, g. the density of the seawater is 10^3\text{ kg/m}^310 3 kg/m 3 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. to make that submarine float neutrally, and neither float nor sink in the ocean, what volume of water does that submarine need to subtract from its tanks?