Question

calcule o valor do × de modo que: a) 2×+3=15 b) 7×-1=13 c)2×-4=3 d) 4×+2=-18 e) 5×-2=7+6 f) 10×+1=-4-5 me ajuda coloquem conta por favor

Answer 1

a) 2x+3=15
2x=15-3
2x=12
x=12/2
x=6

b) 7x-1=13
7x=13+1
7x=14
x=14/7
x=2

c) 2x-4=3
2x=3+4
2x=7
x=7/2
x= 3,5

d) 4x+2=-18
4x=-18-2
4x=-20
x= -20/4
x= -5

e) 5x-2=7+6
5x=7+6+2
5x=15
x=15/5
x=3

f) 10x+1=-4-5
10x=-4-5-1
10x= -10
x= -10/10
x= -1

Answer 2

(a) 2x + 3 = 15
2x = 15 - 3
2x = 12
x = 12 ÷ 2
x = 6

(b) 7x - 1 = 13
7x = 13 + 1
7x = 14
x = 14 ÷ 7
x = 2

(c) 2x - 4 = 3
2x = 3 + 4
2x = 7
x = 7 ÷ 2
x = 3,5

(d) 4x + 2 = -18
4x = -18 -2
4x = -20
x = -20 ÷ 4
x = -5

(e) 5x - 2 = 7 + 6
5x - 2 = 13
5x = 13 + 2
5x = 15
x = 15 ÷ 5
x = 3

(f) 10x + 1 = -4 -5
10x + 1 = -9
10x = -9 -1
10x = -10
x = -10 ÷ 10
x = -1

Espero ter ajudado.
Bons estudos!