Question

Resolva a Equação! a) 2× +5 =120B)9× + 120 =+300C)-4×=100D)2×-1=10E)-× +8=2 Me ajudem por favor

Answer 1

$a) \\ 2x+5=120 \\ 2x=120-5 \\ 2x=115 \\ x= \frac{115}{2} ~~~~ ou~~~x=57,5 \\ \\ b) \\ 9x+120=300 \\ 9x=300-120 \\ 9x=180 \\ x=180\div9 \\ x=20 \\ \\ c) \\ -4x=100 \\ x=100\div(-4) \\ x=-25 \\ \\ d) \\ 2x-1=10 \\ 2x=10+1 \\ 2x=11 \\ x= \frac{11}{2} ~~~~~ou ~~~~x=5,2 \\ \\e) \\ -x+8=2 \\ -x=2-8 \\ -x=-6~~~\times(-1) \\ \\x=6$