Oof this one is hard I think it’s 20 mm but I’m not sure
        
             
        
        
        
Answer:
(0,1)(1,4)
Step-by-step explanation:
Put in any value of x to find y, then you have a coordinate, then plot it 
lets say i pick 0 for x
y = 3(0) + 1 
y = 1 
(0,1) 
lets say i also pick 1 for x 
y = 3(1)+1 
y = 4
You need atleast two points to plot a line, these are two points. 
 
        
             
        
        
        
We know the measure of one of the angles.Angle b which is 90.
Now we have to find the other two angles.
First we will find angle a.
There are 180 degrees in a straight line.
Sooo...
180-130=50
Angle a will be 50.
There are also 180 degrees in a triangle.
To find the last angle we do this
180-50-71=59
Your answer and the measure of angle c will be 59 or option 3.