Zadanie 7/133 (Matematyka)
Rozwiąż graficzne układy równań:
a) {x + y = 5
{x - y = 1
b) {4x = 8
{3y = 6x - 12
c) {3x - 2y = 1
{-x - y = -2
Dam najj !! Proszę o rozwiązanie ;)
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a)
x+y = 5
x-y = 1
y = -x +5
y = x-1
b)
4x = 8 /:4
3y = 6x – 12 /:3
x = 8
y = 2x – 4
c)
3x – 2y = 1
-x – y = -2
-2y = - 3x + 1 /: (-2)
- y = x -2 /* (-1)
y = 1 ½ x – ½
y = -x + 2