Test exam #4 time remaining: 00: 48: 55 submit test this : 1 pt 3 of 18 (5 complete) this test: 18 pts possib the marginal profit in dollars on brie cheese sold at a cheese store is given byp4+60x), where x is the amount of cheose the "profif is $80 when no cheese is sold. a. find the profit function b. find the profit from selling 300 pounds of brie cheese a. find the profit function. b. find the profit from selling 300 pounds of brie cheese. the profit from selling 300 pounds of brie cheese is $ enter your answer in each of the answer

(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3

10

step-by-step explanation:

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