3. 9
--- • 3 = ---
5. 15
2. 10
--- • 5 = ---
3. 15
--------
19/15 or 1 4/15
3x+2(x-1)=9x=4
We move all terms to the left:
3x+2(x-1)-(9x)=0
We add all the numbers together, and all the variables
-6x+2(x-1)=0
We multiply parentheses
-6x+2x-2=0
We add all the numbers together, and all the variables
-4x-2=0
We move all terms containing x to the left, all other terms to the right
-4x=2
x=2/-4
x=-1/2
In expanded form that would be 4 + 0.2 + 0.09 + 0.003
Hope that helps :)
The answer to "12x-(4y+7z) for x=9 y= 4 and z = 2" is 78.
Multiply 1/5 by 11 to get 2.2, to check, multiply 2.2 by 5. The answer though, is 2.2.
