a+b=19 a-b=5 berapa axb

[tex]a + b = 19 \\ a - b = 5 \\ - - - - - - - - - - ( - ) \\ 2b = 14 \\ b = 7 \\ \\ a + b = 19 \\ a = 19 - 7 = 12[/tex]
a x b = 12 x 7 = 84

semoga membantu..

12+7=19
12-7=5
12x7=84
jawabannya 84