Sub in given values to get 2 equations.

Solve system using elimination. Add the equations together, cancelling out 'b'

Sub into first equation to get value for 'b'
So you convert the fraction into a decimal then multiply it by 100 so the percentage would be 180%
Step-by-step explanation:
11.
Area of rectangle = 408 in²
Length = 3x-2 and width = x
The area of a rectangle is given by :
A = lb
(3x-2)x = 408
x = 12 inch and x = -11.33 in
Neglecting negative value,
The width of rectangle = 12 inch
The length of rectangle = 3x-2 = 3(12)-2 = 34 inch
12.
Base of triangle = 2x+2
Height = x
The area of a triangle is given by :

x = 24 cm and x = -25 cm
Neglecting negative value, x = 24 cm
Base = 2x+2 = 2(24)+2 = 50 cm
Hence, this is the required solution.
There’s an app called photo math where u can take a picture of the problem and it gives u the answer.
hope that helps lol