7 is the y intercept
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If you meant, your two equations are y=2x+2 and y= 8x+1 your vertex will be at x=1/6 and y=7/3 you can plug these in and they will check out. but if you meant, y=(2x2) +8x+1 y=4+8x+1 y=8x+5 and then you only have one line so there will be no vertex. but the y intercept is at (0, 5) and your x-intercept at (-5/8, 0) if neither are these are what you are saying, sorry, and maybe try and repost and I will help you out.
If -8x+3=251, then 8x=-248. Therefore, x=-31.
8x + 3 = 50 8x = 47x = 47/8x= 5 and 7/8ths
8x - 9 = 11x + 12 8x = 11x + 21 -3x = 21 x = -7
8x-4 = -7+5x 8x-5x = -7+4 3x = -3 x = -1