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1)
x +2y = 9
y - 1 = 3x
-----------------
x + 2y = 9
y = 3x + 1
--------------
x + 2*(3x + 1) = 9
x + 6x + 2 = 9
7x = 7
x = 1
====
y = 3*1 + 1 = 4
================
Odp. x = 1 , y = 4
=====================
2)
x - y = 5
x + 2 y = - 1
---------------------
y = x - 5
x + 2*(x - 5) = - 1
-------------------------
x + 2x - 10 = - 1
3x = 9
x = 3
=====
y = 3 - 5 = - 2
=============
Odp. x = 3 , y = - 2
=======================
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1)
x +2y = 9
y - 1 = 3x
-----------------
x + 2y = 9
y = 3x + 1
--------------
x + 2*(3x + 1) = 9
x + 6x + 2 = 9
7x = 7
x = 1
====
y = 3*1 + 1 = 4
================
Odp. x = 1 , y = 4
=====================
2)
x - y = 5
x + 2 y = - 1
---------------------
y = x - 5
x + 2*(x - 5) = - 1
-------------------------
x + 2x - 10 = - 1
3x = 9
x = 3
=====
y = 3 - 5 = - 2
=============
Odp. x = 3 , y = - 2
=======================