Question

Mr. James asked his students that which of the following equations can be formed using the expression x = 5:

a)2 x + 3 = 13
b)3x + 2 = 13
c)x –5 =
1d)4x –9 = 21

Answer 1

`2x + 3 = 13 \\ 2 * 5 + 3 = 15 \\ 10 + 13 = 15 \\ 23 = 15 \\ 23 - 15 = 8 \\ \\ 3x + 2 = 13 \\ 3 * 5 + 2 = 13 \\ 15 + 2 = 13 \\ 17 - 13 \\ = 4 \\ \\ x - 5 = 0 \\ 5 - 5 = 0 \\ 0 = 0 \\ \\ 4x - 9 = 21 \\ 4 * 5 - 9 = 21 \\ 20 - 9 = 21 \\ 21 - 11 \\ = 10`