(10+2x)(8+2x) = 120
4x^2 + 36x + 80 = 120
x^2 + 9x + 20 = 30
x^2 + 9x - 10 = 0
(x+10)(x-1) = 0
x = 1 inch dimension
X + 2y = 8
x = -2y + 8....so we sub -2y + 8 for x in the other equation
2x + y = 7
2(-2y + 8) + y = 7
-4y + 16 + y = 7
-3y = 7 - 16
-3y = - 9
y = -9/-3
y = 3
x = -2y + 8
x = -2(3) + 8
x = -6 + 8
x = 2
solution is (2,3)
Answer:
The answer is C.
Step-by-step explanation:
Answer: 8
Step-by-step explanation: