The temperature at noon was -30C. By 10.P. M. on the same day the temperature decreased by 5.50. What is the temperature at 10 P. M? -8.40C

-5.40C

-2.40C

1.60C

Step-by-step explanation:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

to complete this square you have to rotate about the origin 270 degrees clockwise.