x=2y-7
8x+5y=7
rearrange things to a standard format:
x - 2y = -7
8x + 5y = 7
multiply #1 by 8:
8x - 16y = -56
8x + 5y = 7
Now just subtract, and the x's are eliminated...
8x+5y=7
x - 2y = -7
8x + 5y = 7
multiply #1 by 8:
8x - 16y = -56
8x + 5y = 7
Now just subtract, and the x's are eliminated...