Question

For which equation is x = 9 a solution?

A. 3x – 7 = –34

B. x – 9 = 1

C. x/9-8=9

D. 4x + 5 = 41

Answer 1

answer

D. 4x + 5 = 41

4(9) + 5 = 41
36 + 5 = 41
41 = 41 (TRUE)

Answer 2

Substitute the value of x = 9 to the equations:


`A.\ 3x-7=-34\\\\L_s=3\cdot9-7=27-7=20;\ R_s=-34\\\\L_s\\eq R_s\\\\B.\ x-9=1\\\\L_s=9-9=9;\ R_s=1\\\\L_s\\eq R_s\\\\C.\ (x)/(9)-8=9\\\\L_s=(9)/(9)-8=1-8=-7;\ R_s=9\\\\L_s\\eq R_s\\\\D.\ 4x+5=41\\\\L_s=4\cdot9+5=36+5=41;\ R_s=41\\\\L_s=R_s`

Answer: D. 4x + 5 =41