Відповідь:

[tex]x+y=1.25+1.5=2.75[/tex]

Розв'язання:

[tex]\displaystyle \left \{ {{2x-3y=-2} \atop {4^{2x-1}=8\;\;\;\;\;\;}} \right. \\\\\\\left \{ {{2x-3y=-2\;\;\;\;\;} \atop {2^{2(2x-1)}=2^3\;\;\;\;\;\;}} \right. \\\\\\\left \{ {{2x-3y=-2\;\;\;\;\;} \atop {2(2x-1)}=3\;\;\;\;\;\;}} \right. \\\\\\\left \{ {{2x-3y=-2\;\;\;\;\;} \atop {4x-2}=3\;\;\;\;\;\;\;\;\;}} \right. \\\\\\4x-2=3\\\\4x=5\\\\x=1.25\\\\2\cdot 1.25-3y=-2\\\\2.5-3y=-2\\\\-3y=-4.5\\\\y=1.5\\\\\\x+y=1.25+1.5=2.75[/tex]