070-MIJ Grade 8 Pre-Algebra Sem 2 V19
Finding Image Points for 90° Counterclockwise Rotations
What are the coordinates of F'?
Use the work shown to find the image of point F(-1,6)
after a 90° counterclockwise rotation,
(x, y) - (-y, x)
Switch the x-and y-coordinates: (6,-1)
*
(6,-1)
(-6,1)
(-6,-1)
(6,1)
Multiply the new x-coordinate by-1: (6(-1), -1)
Simplify

b

step-by-step explanation:

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

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,