Without solving, decide what method you would use to solve the system: graphing, substitution, or elimination. explain.

3m-4n=1
3m-2n=-1

3m-4n=1
3m-2n=-1
I wouldn't graph because I'm lazy

I wouldn't subsitute because I'm too lazy to put it into a form m=something or n=something

i would eliminate because the m's are both 3, just multiply the top equaiton by -1 and add them equations to get 2n=-2, so n=-1,then m=-1 so then (-1,-1) is solution

eliminate

1 journal = 280 grams 3 journals = 280 * 3 280 * 3 = 840 Total weight of 3 journals = 840 grams