Question: How do I create different tickmark spacing on the x and y axes?

I am having trouble understanding how to put different tickmark spacing on the x and y axes.  Would someone be kind enough to show me the syntax of a plot command which plots the function y=x from x=-1..1 with tickmarks spaced 0.25 apart on the x-axis and 0.2 apart on the y-axis?

 

Thank you

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