Answer:
(7/4)x - 10
Step-by-step explanation:
y = mx + c
m = gradient
c = y-intercept
so you just substitute in the respective values
 
        
             
        
        
        
We are looking for a new number which is 30 less than 10. We will get the new number by subtracting 30 from 10. We write it down as: 10-30=-20
And finally the solution for: What number is 30 less than 10? is -20 
Hope this helps!!
        
                    
             
        
        
        
Step-by-step explanation:
2x²+2xy+yx+y²+2x²+2xy-yx+y²
2x²+2x²+2xy+2xy+yx-yx+y²+y²
2x²+2x²+2xy+2xy
4x²+4xy
 
        
                    
             
        
        
        
The first car consumed 21 gallons while the second car consumed 49 gallons. here is the how it's done. 
for the first car gallons consumed is 15/50x70= 21 gallons
the second car consumed 35/50x70=49 gallons
        
             
        
        
        
Symmetric Property
Hope This Helps and God Bless!