Question

Determine o conjunto verdade das seguintes equações do

1ºgrau.


1) 4x-3 =x+9
2) 5x-28= 3x+12
3) 2(y-3) – 4(y-2) =-2

4) 13y-(2y+3) = -11y-3
5)8y – 5(2y + 3) = 2
ME AJUDEM POR FAVOR!!!​

Answer 1

Resposta:

1) 4x-3 =x+9

$4x-3-x-9=0\\3x-12=0\\3x=12:(3)\\x=4$

2) 5x-28= 3x+12

$5x-28-3x-12=0\\2x-40=0\\2x=40:(2)\\x=20$

3) 2(y-3) – 4(y-2) =-2

$2y-6-(4y-2)=-2\\2y-6-4y+2+2=0\\-2y-2=0\\-2y=2.(-1)\\2y=-2:(2)\\y=-1$

4) 13y-(2y+3) = -11y-3

$13y-2y-3=-11y-3\\11y-3+11y+3=0\\22y=0\\y=0$

5)8y – 5(2y + 3) = 2

$8y-(10y+15)=2\\8y-10y-15-2=0\\-2y-17=0\\-2y=17.(-1)\\2y=-17\\\\y=-\frac{17}{2}$