Start using assigning a variable, and literal translation.
Given x is the shorter leg.
SEGMENT OR SIDE NUMBER
short leg x
long leg -9+3x
hypotenuse 1+2x
If legs of a right triangle are a and b, and if hypotenuse is c, then we have a relationship among them, , Pythagorean Theorem Right Triangle Formula.
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Make the substitutions and solve for x.....