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Drake Woodward
Mathematics
16 November, 09:52
8x+4y=-20
6x+6y=-18
-7x+7y=-21
4x-2y=22
+5
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Carlie Pollard
16 November, 09:55
0
8x + 4y = - 20 ⇒ 24x + 12y = - 60
6x + 6y = - 18 ⇒ 12x + 12y = - 36
12x = - 24
12 12
x = - 2
8x + 4y = - 20
8 (-2) + 4y = - 20
-16 + 4y = - 20
+ 16 + 16
4y = - 4
4 4
y = - 1
(x, y) = (-2, - 1)
-7x + 7y = - 21 ⇒ - 14x + 14y = - 42
4x - 2y = 22 ⇒ 28x - 14y = 154
14x = 112
14 14
x = 8
-7x + 7y = - 21
-7 (8) + 7y = - 21
-56 + 7y = - 21
+ 56 + 56
7y = 35
7 7
y = 5
(x, y) = (8, 5)
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