Question

Matemática vale 10 pontos so isso que eu tenho hoje por favor me ajudar;( é sobre equações

Answer 1

$a)\\\\x+y=48\\x-y=10\\\\\Rightarrow x+x+y-y=48+10\Rightarrow 2x=58\Rightarrow x=29\\29+y=48\Rightarrow y=19\\\\b)\\\\2x+y=13\\x-y=-1\\\\\Rightarrow 2x+x+y-y=13+(-1)\Rightarrow 3x=12\Rightarrow x=4$

$-y=-4-1\\y=5$

$c)\\\\3m+n=10\\2m-n=-20\\\\\Rightarrow 5m=-10\Rightarrow m=-5\\3.(-5)+n=10\Rightarrow -15+n=10\Rightarrow n=25$

$d)\\\\a+b=35\\a-b=18\\\\2a=53\Rightarrow a=\frac{53}{2}\\\\\frac{53}{2}+b=35\Rightarrow b=35-\frac{53}{2}=\frac{70-53}{2}=\frac{17}{2}$

Answer 2

1) a- 3+3/ 5+1 / 4+2
b- 3-3/6-6/ 4-4
c- 3.4-6 / 3.5-9 / 3.6-12

2) a- X= 34 Y=14
b- X= 4 Y= 5
c- M= -2 Y= 16
d- n achei