y=+6 or y=-3
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y = 0" the answer is YES.
The line with equation crosses the y-axis at (0, 0), so the y-intercept is 0. While the line with equation x = 1 does not cross the y-axis at all (it is parallel to it), so it has no y-intercept.
Yes, the equation has a slope of 0.
Because when your solving a quadratic equation your looking for x-intercepts which is where why equals 0 and x equals what ever the answer is.
y and x cannot both be zero and still satisfy the equation.