Can someone tell me what i did wrong with my verify? the left side does not equal to the right side

well your right the answer is -8

Step-by-step explanation:

here's what you should do

1) Simplify both sides of the equation.

3+4(x−3)=5−2(−3x−1)

3+(4)(x)+(4)(−3)=5+(−2)(−3x)+(−2)(−1)(Distribute)

3+4x+−12=5+6x+2

(4x)+(3+−12)=(6x)+(5+2)(Combine Like Terms)

4x+−9=6x+7

4x−9=6x+7

2) Subtract 6x from both sides.

4x−9−6x=6x+7−6x

−2x−9=7

3) Add 9 to both sides.

−2x−9+9=7+9

−2x=16

4)  Divide both sides by -2.

−2x

−2

=

16

−2

x=−8

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.