Oblicz obwód narysowanej figury.
Zadanie w załączniku
x = 2y+3
x+y = 15-y
x-2y = 3
x+2y = 15
-------------
+
2x = 18/:2
x = 9
-------
2y = 15-x
2y = 15-9
2y = 6/:2
y = 3
Obwód prostokąta:
L = x+x+y+2y+3+15-y
L = 2x + 2y +18
L = 2 *9 + 2 * 3 +18
L = 42
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x = 2y+3
x+y = 15-y
x-2y = 3
x+2y = 15
-------------
+
2x = 18/:2
x = 9
-------
2y = 15-x
x = 9
2y = 15-9
2y = 6/:2
y = 3
-------
Obwód prostokąta:
L = x+x+y+2y+3+15-y
L = 2x + 2y +18
L = 2 *9 + 2 * 3 +18
L = 42
======