One of the physical properties of minerals is streak which is . . . (2 points) a) The mineral color b) The way a mineral surface scatters light c) The Scratching resistance of a mineral d) The mineral color crushed on an unglazed porcelain plate e) The tendency of a mineral to break along planes of lattice weakness

a) The mineral color

Explanation:

The streak is the color of the mineral in its powder form. This is one of the important physical properties. This shows the true color of the mineral. The color is the important distinguishing feature for comparing the minerals. The two different minerals can have the same color exteriorly but usually have different color in powdered form.

Also the trace minerals can change their color appearance of the mineral by causing reflection of light. The trace minerals can have a little effect on the reflection on the small powdery particles in the streak.  

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)