8x - 7y = 7 (A)7x + 8y = 8 (B)
7*(A): 56x - 49y = 49
8*(B): 56x + 64y = 64
8*(B)-7*(A): (64+49)*y = 64-49
=> 113y = 15
=> y = 15/113
7y+ 8x + 4= 20 + 8x- 8x - 8x7y + 4 = 20- 4 - 47y=16/7 /7y= 2.28the /7 means divide by 7 :)
Being that there is no equal sign in either of these, you cannot tell. It is hard to figure out what is equal to what. If the equal sign is in the right spot on each of these, they would be. 8x + 7y = 1 -40x = 35y + 1