Question

Equações de 1° grau

1). 291x+432=191x-68

2). 4(5y+y)=210

3). 3(6+3y)+2=(y-9)-1

4). x-(7x+5)=11-3x

Answer 1

291x + 432 =191x -68
291x- 191x= -432 -68
100x = 500
x= 500 : 100 
x = 5

4(5y+y)=210
4+6y=210
6y=210-4
6y=206
y = 206 : 6
 y= 34.3

x-(7x+5) = 11-3x
x-7x+5=11-3x
x-7x+3x=11-5
4x-7x=6
-3x=6
x=6:3
x=2
 
3(6+3y)+2=(y-9)-1
3+6+3y+2=y-9-1
3y-y=-9-1-3-6-2
2y= -