Find x-coordinate For Two Points

Set 1.5

In Exercises 42 and 43, determine the x-coordinates of the points A and B. (Each dashed line is parallel to a coordinate axis). Explain how this is done.

 

42.
the x-coordinates of the point A is 1
proof:
1.5=x/2+1
3=x+2
3-2=x
x=1

and the x-coordinates of the point B is 3
2.5=x/2+1
5=x+2
x=5-2
x=3

43.

0.4=x^2/2
x^2=0.8
x=sqrt(0.8)
x≈0.894427
the x-coordinates of the point A is x≈0.9

0.6=x^2/2
x^2=1.2
x=sqrt(1.2)
x≈1.09545
the x-coordinates of the point B is x≈1.1

 

The David Cohen precalculus textbook is no joke. It is a lot harder than the Ron Larson textbook.