Any other time I would answer this sorry
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I’m pretty sure you just solve exactly like that 
-7(-2)-1 =13 at least I’m told that \_( •-• )_/
        
             
        
        
        
Answer:
Well here's the issue...
Step-by-step explanation:
Since we have no idea what car you'll be using for the experiment, I can't tell you how many times you will have to fill er' up either. let's say you have a fuel efficient car like 27 mpg. that's highway and city combined. (34/25) And the trip is 216 miles round trip. And let's say you used 0 gallons while you were there. You would need to fill up exactly 8 times to get there and back.  That's going off of 27 miles per gallon.
Hope this helps!!
 
        
             
        
        
        
Answer:8
Step-by-step explanation:
 
        
             
        
        
        
Answer: infinitely many solutions
Step-by-step explanation: 6y = -3x + 30 rewrites to 3x + 6y = 30
1. align equations x + 2y = 10
                            3x + 6y = 30
2. multiply first equation by -3 to get -3x - 6y = -30
3. align equations -3x - 6y = -30
                                3x + 6y = 30
4. add the equations and you they cancel out, which means infinitely many solutions