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Use a service like tinyurl.com tr.im or bit.ly to get a short version of the link to the image. You should be able to post that without the "..."

Divide it by 10, cast as an integer to truncate the decimal and multiply back by 10: $var = 44; $roundvar = ((int) ($var/10)) * 10; //$roundvar should equal 40

So fgets() returns the whole file in one go? If not then you have to manually add line breaks after each line fgets() gets like so: <?php $file = fopen("test.txt","r"); while(! feof($file)) { echo fgets($file). "<br>"; } fclose($file); ?>

get y to one side: 2x + 3y + 6 = 0 3y = -2x - 6 y = (-2/3)x - 2 This form is "y = mx + b" where 'm' is the slope. Slope: -2/3