Rozwiąż układy równań:
a)
{-x -y = 2
{2(3x+y) = -20
b)
{4x + 3y = 54
{1/3x = 4(1 + 1/8y)
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{ układ równań
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a)
{-x -y = 2
{2(3x+y) = -20
-x = 2 + y
6x + 2y = -20
x = -2 - y
6(-2 - y)+ 2y = -20
x = -2 - y
-12 - 6y + 2y = -20
x = -2 - y
-4y = -8 /:-4
x = -2 - y
y = 2
x = -4
y = 2
b)
{4x + 3y = 54
{1/3x = 4(1 + 1/8y)
4x + 3y = 54
1/3x = 4 + 1/2 y /*3
4x + 3y = 54
x = 12 + 3/2y
4(12+3/2y) + 3y = 54
x = 12 + 3/2y
48 + 6y +3y = 54
x = 12 + 3/2y
9y = 6 /:9
x = 12 + 3/2 y
y = 6/9 = 2/3
x = 12 + 3/2 * 2/3
y = 2/3
x = 13