Passes through (12,3) and (9,5)

m = -2/3

Step-by-step explanation:

We can find slope using the two given points (m represents slope)

(x1, y1) = (12,3)

(x2, y2) = (9,5)

m = (y2-y1)/(x2-x1)  

m = (5 - 3)/(9 - 12)

m = 2/-3

The slope of the line that passes through the two given points is -2/3.

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: