That equation has no "solution" ... no single pair of numbers for 'x' and 'y' that makes it true.
In fact, it has an infinite number of them.
Here are a few:
x=1, y=-4
x=2, y=-9
x=-3, y=16
y = -5x + 1 is the equation of a line.
Every point on the line has the coordinates (x,y), and every point satisfies the equation.
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5x+1=20 5x=20-1 5x=19 5x/5=19/5 x=19/5
x=8
f(x) = x2 + 5x + 1 The roots of this equation are x = -0.2087 and x = -4.7913 (approx).
2x + 5x - 1 = 9x 7x - 1 = 9x -1 = 9x - 7x -1 = 2x -1/2=x
7x -3 = 5x + 1 solve for xadd three to both sides7x = 5x + 4subtract 5x from both sides2x = 4divide both sides by 2x = 2