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More values are required to solve this question since there are only two unknowns given. To solve this equation, there has to be only a single unknown value. In this example, assuming x is 0,

0 = y2 + 2y

0 = y (y+2)

y = 0 or y+2 = 0

y = 0 pr y = -2

Therefore, in this case, the points of intersection are (0,0) and (0,-2)

If x=y

Y = y2 + 2y

0 = y2 + y

0 = y(y+1)

y = 0 or y+1 = 0

y = 0 or y=-1

When y=0

x=0

When y=-1

x=-1

Therefore, in this case, the points of intersection are (0,0) and (-1,-1)

Note: to solve quadratic equations, cubic equations or any equation with any unknowns not to the power of 1, you must get a value of 0 on one side of the equation before you can get the final values.

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Q: What are the points of intersection of X equals y squared plus 2y?
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