
notice the original, and the new one, with the tripled "r" and "h" is just, whatever the original was times 27, namely 27 times as large as the original.
Since it is an equilateral triangle, all of the sides are the same length.
So, x=14 :)
Hope this helps!
Finish the equation given for x:
10x +15 = 9(9)
= 10x +15 = 81
Subtract 15 from both sides:
10x = 66
Divide both sides by 10:
x = 66/10
X = 6.6
Now replace x with 6.6 in the equation for DE:
DE = 2(6.6) +3
Simplify:
DE = 13.2 + 3
DE = 16.2
Rise over run or the change in Y over the change in X