Question

duwayne wrote a two-digit number. he multiplied it by 3, added 18, and divided by 8. his final answer was 9. what number did duwayne write?

Answer 1

Go backwards and do the opposite. (9x8)=x
x-18=y
y/3 = z

Answer 2

2-digit no --- x
multiplied by 3 --- 3x
added 18 --- 3x+18
divided by 8 --- (3x+18)/8
got 9

(3x+18)/8 = 9
3x+18 = 72
3x = 54
x =18

Answer 3

thank you. how did you get raid of the 8 on the left side?

Answer 4

3x+4y=18;kx_4y=180 solved?