Question

Which equations have the same value of x as Three-fifths (30 x minus 15) = 72? Select three options. 18 x minus 15 = 72 50 x minus 25 = 72 18 x minus 9 = 72 3 (6 x minus 3) = 72 x = 4.5

Answer 1

`18x-9=18x-9\\\\3(6x-3)=18x-9\\\\x=4.5`

Explanation:

Each equation is =72. So for the first 4 options, just find equivalent expressions for the left side:

`(3)/(5)(30x-15)=18x-9\\\\18x-15\\eq 18x-9\\\\50x-25\\eq 18x-9\\\\18x-9=18x-9\\\\3(6x-3)=18x-9`

For x=4.5, must solve original equation:

18x-9 = 72

18x = 81

x = 4.5