Distribute the 2 to get the pink box
10x + 2y = 18
Then if we are subtracting the bottom equation from the pink box
10x + 2y = 18
-(10x -7y = -18)
9y = 36
y = 4
6u²*(2u-5)²-12u²*(2u-5)*(u+5)
-90u²*(2u-5)
10) Enlarging by a factor of 7 corresponds to an increase by a factor of

for the area, or 49. The new rectangle has area 980 square-inches.
To verify, let's say the dimensions of the original rectangle are

. We increase each dimension by a factor of 7 to get

. This new area is 980 square-inches.
11) We use the same concept. Increasing by a factor of 0.6 corresponds to increasing the area by

(n.b., an increase by a factor less than 1 is shrinking). Original area is

. New area is

.
12) We multiply 15 by 11/30 to get 5.5 ft. We multiply 8.25 by the same factor to get 3.025 ft. The area is

.
Answer:
10x-20
Step-by-step explanation:
5(2x-4)
5x2=10
5x4=20