book Maths Puzzle Numerical Ability

The first side of a triangle is 8 meters shorter than the second side. The third side is 4 times as long as the first side. The perimeter is 26 meters. Find the length of each side.

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I am having trouble with graphing Liner Inequality can someone help me? If the plots on the graph are (0, 3) (2, 0) What would the equation look like? Can someone help me please, Thank you for all of your help:

-2/3(6/5-7/10)=17/20