Question

Resolva as equações :
a) 4x + 8 = 3x - 5
b) 3a - 4 = a + 1
c) 9y - 11 = - 2
d) 5x - 1 = 8x + 5

Answer 1

$a) \\ 4x+8=3x-5 \\ \\ 4x-3x=-5-8 \\ \\ x=-13 \\ \\ b) \\ 3a-4=a+1 \\ \\ 3a-a=1+4 \\ \\ 2a=5 \\ \\ a= \frac{5}{2} \\ \\ c) \\ 9y-11=-2 \\ \\ 9y=-2+11 \\ \\ 9y=9 \\ \\ y= \frac{9}{9} =1 \\ \\ d) \\ 5x-1=8x+5 \\ \\ 5x-8x=5+1 \\ \\ -3x=6 \\ \\ x=- \frac{6}{3} =2$