Answer:
7. M = (-1.5,7)
8. (8,4)
9. m<QRS=46°
Explanation:
7. Use the midpoint formula which is (x1+x2/2 , y1+y2/2)
So (-1-2/2 , 9+5/2)
(-3/2 , 14/2)
So M = (-1.5,7)
8. This is one simple if you understand.
Since (-6,6) is the starting end point and (1,5) is the mid point then (8,4) has to be the other end point. -6 to 1 is +7. 1 to 8 is +7. 6 to 5 is -1. 5 to 4 is -1.
9. 3x-8+2x+6=98
5x-2=98
5x=100
x=20
So plug in x for QRS
2(20)+6
40+6
46
Hope this helps