Using substitution, what would be the best first step to solve this system of equations?

subtracting x from the first equation

Step-by-step explanation:

then you could plug in y=10-x into the second equation and it'd look like this:

2(10-x)=x+6

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,

x-3y=4

step-by-step e