-- In the equation of the graph, set x=0.
-- Solve the equation for 'y'.
-- The value you get for 'y' when x=0 is the y-intercept.
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There is no slope nor intercept because there is no equation, simply an expression.
The magnitude of a vector is a geometrical value for hypotenuse.. The magnitude is found by taking the square root of the i and j components.
"Magnitude" is the size or distance. Its measure depends on the metric that is defined on the relevant space.
The magnitude is the length of the vector (using any scaling factor that may have been employed).
Use trigonometry.