1. solve the system by using a table. 3y=4x+7 , -4x-4y=28. these are the possible solutions: a) (–4, –3), b) (–3, –4), c) (4, 3), d) (3, 4).
2.solve by graphing. -3x-y=-10, 4x-4y=8. possible solutions: a) (-1,3), b) (3-1), c) (1,3), d) (3,1)
3. the spreadsheet shows the monthly revenue and expenses for a new business. use the models to predict the month in which revenue will equal expenses. possible answers:
a) october
b) september
c) august
d) may

1) (A) (-4,-3)

2) (D) (3,1)

3) (B) September

Step-by-step explanation:

1) 4x+7=3y

-4x-4y=28

By elimination method, we get y= -3 and x= -4

Hence (A)(-4,-3) is correct.

2) We will pot the points for the equations -3-y= -10 and 4x-4y = 8

The point of intersection is the solution that is (D) (3,1).

3) We can solve it by assuming  revenue - expenses, and for revenue= expenses

We need to prove difference = 0

Let x denotes the month and y denotes the difference between revenue and expenses.

Then for January = (1,18000)

Feb = (2,15000)

march = (3,12000)

April =  (4,11000)

may =  (5,9000) and so on  

The best fit line for the points is y= -2200x+19,600

We need y= 0

Then, x = 19,600/2200

            = 8.9 = 9 (approx)

In 9th month (September) the difference will be 0 and revenue = expenses.

(B) is correct.

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

the awnser is visionary