Lines are infinite and so do not have a highest or lowest point.
You need to have a curve to have a possible lowest point.
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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
graph it
By the substitution method By the elimination method By plotting them on a graph
To find the inflection points on a graph, you need to take the second derivative. Then, set that equal to zero to find the x value(s) of the inflection point(s).
A pair of numbers are usually (x,y) if u want to determine a point on a graph. Find the value for both x and y and then plot them on a graph