Answer:
The equation of the line that passes through (-1,2) and is perpendicular to y=1-2x is 
Step-by-step explanation:
We need to write the equation of the line that passes through (-1,2) and is perpendicular to 
The equation must be in form
has m equals to slope and c equals to y-intercept
So, we need to find slope and y-intercept.
Finding Slope
When the lines are perpendicular there slopes are opposite to each other.
Slope of given equation is:

We can write it as:
Comparing it with
we get m = -2
Now, The slope of given equation is: m = -2
The slope of required equation will be: m=
Finding y-intercept
Using point (-1,2) and slope m=
, we can find y-intercept

So, y-intercept is: c = 
Equation of line
Now, the equation of line having slope m=
and c =
is:

So, the equation of the line that passes through (-1,2) and is perpendicular to y=1-2x is 