Question is on the image attached. Pls included a detailed answer. very confused.

When we add two equations, it's important to combine like terms

x's with x's

y's with y's

and constants with constants

2x + 5x = 7x

3y + (-y) = 2y

-5 + -12 = -17

Let's put everything together for a final equation

7x + 2y - 17 = 0

or

7x + 2y = 17

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,