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a )
jika x = 1 --> x + 5 = 9
1 + 5 = 9 ( salah)
jika x = 2 ---> x + 5 = 9
2 + 5 = 9 (salah)
jika x = 3 -- > x + 5 = 9
3 + 5 = 9 (salah)
jika x = 4 --> x + 5 = 9
4 + 5 = 9 ( benar)
jika x = 5 --> x + 5 = 9
5 + 5 = 9 (salah)
jika x = 6 --> x + 5 = 9
6 + 5 = 9 (salah)
jd jawabnya x = 4
untuk yg b sampai d coba adee kerjakan , dg cara yg kk' kasih contoh itu
no 2)
a) 5 + p = -2
p = -2 -5
p = 3
b) 5a + 18 = 2a
5a - 2a = -18
3a = -18
a = -6
c) 6x + 4 = 2x + 8
6x - 2x = 8 - 4
4x = 4
x = 1
d) 2x - 3 = x + 5
2x - x = 5 + 3
x = 8
e) 1/2 ( 4x - 5) = x + 5 1/4
2x - 5/2 = x + 5 1/4
2x - x = 5 1/4 + 5/2
x = 21/4 + 10/4
x = 11/4
f) 3/4 ( a+4) - 2/3(3/4 + a) = 1/2 untuk mudahnya kalikan kedua ruas dg 12
9 (a+4) - 8(3/4 + a) = 6
9a + 36 - 6 - 8a = 6
a + 30 = 6
a = -24
untuk no 3 , 4 dan 5 , kk' jawab di postingan yg lain yaa