Well, let's take a deep breath and look at this equation together. To solve for x and y, we need more information or another equation. This equation alone has multiple solutions without more context, like a second equation or specific values for x or y. Just like painting a beautiful landscape, we need all the colors to create the full picture.
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1 + 7y = 5x - 2 7y = 5x - 3 - 5x = - 7y - 3 x = 7/5y + 3/5 ---------------------
5y explanaition 5x-5x=0, 0-2y=-2y, -2y+7y=5y
7y+5=-9... 7y must equal -14 therefore y must be -2
i dont know
25x2-49y2 is the difference of two squares and can be factored as:- (5x-7y)(5x+7y)