If you mean: y = 7x+2 then it is a straight line equation whereas 7 is the slope and 2 is the y intercept
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x+7x+3y-y =8x+2y =2(4x+y)
3x+7x+3+y= 10x+3+y
You can get it to vertex form by completing the square: y = x2 + 7x + 4 ∴ y = x2 + 7x + (7/2)2 - (7/2)2 + 4 ∴ y = (x + 7/2)2 - 49/4 + 16/4 ∴ y = (x + 7/2)2 - 33/4
2y + 7x + y-1?
The given expression can be simplified to: 7x+4y