Answer:
B). (1,8)
Explanation:
You can build graphical using both equation
- y=x+7
- y=-2x+10
1. When
, so
and when
, so
2. When
, so
and when
, so
So in the image graphic 1 is red and graphic 2 is blue and you can see they cross at (1,8)
To check
1=2 so,

Replacing:
1. y=1+7=8 and 2. y= -2*1 +10=8
So (1,8)