Rozwiąż układy równań:
rozwiązanie w załączniku
a)
x + y = 0
x - y = 10
----------------
x + x + y - y = 10
2x = 10
x = 5
5 + y = 0
y = -5
b)
8x - 6y = 10
7x + y = 5 /*6
42x + 6y = 30
--------------------
8x + 42x - 6y + 6y = 10 +30
50x = 40 /:50
x = 4/5
8 * 4/5 - 6y = 10
32/5 - 6y = 10 /*5
32 - 30y = 50
-30y = 18 / : -30
y = -18/30
y = -6/10
y = -0,6
c)
12p - 7v = -16
p - 3v = -69 /*-12
-12p + 36v = 828
-------------------------
12p - 12p - 7v + 36v = -16 + 828
29v = 812 /:29
v = 28
12p - 7 * 28 = -16
12p - 196 = -16
12p = -16 + 196
12p = 180 /:12
p = 15
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rozwiązanie w załączniku
a)
x + y = 0
x - y = 10
----------------
x + x + y - y = 10
2x = 10
x = 5
5 + y = 0
y = -5
b)
8x - 6y = 10
7x + y = 5 /*6
8x - 6y = 10
42x + 6y = 30
--------------------
8x + 42x - 6y + 6y = 10 +30
50x = 40 /:50
x = 4/5
8 * 4/5 - 6y = 10
32/5 - 6y = 10 /*5
32 - 30y = 50
-30y = 18 / : -30
y = -18/30
y = -6/10
y = -0,6
c)
12p - 7v = -16
p - 3v = -69 /*-12
12p - 7v = -16
-12p + 36v = 828
-------------------------
12p - 12p - 7v + 36v = -16 + 828
29v = 812 /:29
v = 28
12p - 7 * 28 = -16
12p - 196 = -16
12p = -16 + 196
12p = 180 /:12
p = 15