What is the slope of the line passing through the points (2, −5) and (4, 1)? a. 3 b. 2 c. -4/5 d. 5/4

The slope is 3 (answer choice A).

Step-by-step explanation:

Take a look at the two given points, (2, -5) and (4, 1).  As we move from the first point to the second, x increases by 2 and y increases by 6, so that the slope is m = 6/2, or 3.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18