Can somebody find the gradient and the coordinates of the y-intercept for the graph:
y = x + 6

The equation is already is slope intercept form where you can easily point out the gradient, or the slope, and the y intercept.
y=mx+b where m is the gradient, and b is the y intercept. 
Since there is no m, the gradient is 1.
The y intercept had x=0 and y=b
b in this case is 6 
the y intercept= (0,6)

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Do you need with the x value for the minimum? its always between the two intercepts for a parabola