Answer:
0
Step-by-step explanation:
Because when you times a negative with a positive you get zero.
add the 2 equations together
x+y =9
x-y =7
----------
2x = 16
divide by 2
x=8
x+y =9
substitute in x=8
8+y =9
subtract 8 from each side
y =1
(8,1)
Answer:
Step-by-step explanation:
Given that:
Length (l) = 13 cm
Width (w) = 8 cm
Perimeter of the rectangle = 2(l + w) units
P = 2(13 + 8)
P = 2 (21)
P = 42