Gradient is vertical rise / horizontal travel.
If its derived from a mathematical expression, use differential calculus.
If its a data driven ( hand drawn ) line, use best approximation tangent at point required.
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Find the value of the trend line when x = 0
i think you do Vertical/horizontal
divide by the gradient
Draw a tangent to the curve at the point where you need the gradient and find the gradient of the line by using gradient = up divided by across
Yes beccause: (y1-y2)/(x1-x2) = gradient