Answer:
-15
Step-by-step explanation:
I assume that the question is

Then we have

Multiply both sides by -(3/5) to get

 
        
                    
             
        
        
        
3.5x + 6.5y = 1800
Move 3.5x to another side.
6.5y = -3.5x +1800
Divide by 6.5.
y = -3.5/6.5x + 1800
If we round it would be:
Y = 0.5x + 1800
0.5x is the slope and 1800 is the y-intercept. 
Hope that helps.
        
             
        
        
        
Answer:
height ≈ 31 ft
Step-by-step explanation:
The illustration below will form a right angle triangle. He is standing 17 ft away from the base of the statue.  The angle of elevation from the ground to the top of the statue  is 61°. The height of the statue can be computed below.
adjacent side of the triangle = 17 ft
opposite side = a
Using SOHCAHTOA principle
tan 61° = opposite/adjacent
tan 61° = a/17
cross multiply
a = 17 tan 61°
a = 17 × 1.80404775527
a = 30.6688118396
a ≈ 31 ft
 
        
             
        
        
        
It is irrational because it does not repeat a pattern nor does it stop.
        
             
        
        
        
If your question is 25 dollars for the shirt then the ansewer is $26.5 hope this helps.