This problem calls for a simple substitution. We need to substitute 3x in for y in the equation 3x + 2y = 18 and then simplify by combining like terms.
3x + 2y = 18
y = 3x
3x + 2(3x) = 18
3x + 6x = 18
<u>9x = 18</u>
Now, if you want to solve for x, just divide both sides by 9 and simplify:
9x / 9 = 18 / 9
<u>x = 2</u>
Surface Area = 24×9+20×15×2+24×20=1296in²
Answer:
The smallest value of the three numbers would be 9.
Step-by-step explanation:
In order to find this, set the smallest number as x. Then you can set each of the next integers as x + 1 and x + 2. Now we can total all three numbers and set equal to 30 to solve for x.
x + x + 1 + x + 2 = 30
3x + 3 = 30
3x = 27
x = 9
Answer:
55 guests
Step-by-step explanation:
131 = 21 + (2x)
subtract 21 from both sides
110 = 2x
x = 55 guests