Question

resolva as equações ;a) x-3x-5=12
b)4x+9=11
c)6=3y-3
d)5y+2=3y-9

Answer 1

a) x - 3x - 5 = 12
x -3x = 12 + 5
-2x = 17 x(-1)
2x = 17
x = 17/2
x = 8,5

b) 4x + 9 = 11
4x = 11 - 9
4x = 2
x = 2/4
x = 0,5

c) 6 = 3y - 3
-3y = -3 -6
-3y = -9 x(-1)
3y = 9
y =9/3
y= 3

d) 5y + 2 = 3y -9
5y -3y = -9 -2
2y = -11
y= -11/2
y=5,5

Answer 2

A)x-3x-5=12
-4x=12+5
-4x=17
X=17/4
X=4,25

B)4x+9=11
4x=11-9
4x=2
X=2/4
X=0,5

6=3y-3
6+3=3y
9=3y
9/3=y
3=y

D)5y+2=3y-9
5y-3y=-9-2
2y=-11
Y=-11/2
Y=-5,5