Bardzo proszę wmiare szybkie rozwiązanie tych zadań :
zadania w załączniku
z góry dzięki :)
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cacy zadania w zalacznikach :)
zad.1
a) 2x + y = 7
x + 2y = 6,50
zad. 2
a) x + 4y = 0
2x + 3y = 25
x = -4y
2x + 3y = 25
x = -4y
2 * (-4y) + 3y = 25
x = -4y
-8y + 3y = 25
x = -4y
-5y = 25 / : (-5)
x = -4y
y = -5
x = -4 * (-5) = 20
y = -5
x = 20
y = -5
b) 3m + n = 9
2m - 5n = -11
n = 9 - 3m
2m - 5 * (9 - 3m) = -11
n = 9 - 3m
2m - 45 + 15 = -11
n = 9 - 3m
2m = -11 + 45 - 15
n = 9 - 3m
2m = 19 / :2
n = 9 - 3m
m = 9,5
n = 9 - 3 * 9,5 = - 19,5
m = 9,5
n = -19,5
m = 9,5
zad.3
a) 2x + 5y = 7
3x - 5y = 3
___________________
2x + 3x = 7 + 3
5x = 10 / : 5
x = 2
2x + 5y = 7
2 * 2 + 5y = 7
4 + 5y = 7
5y = 7 - 4
5y = 3 / :5
y = 3/5
b) 5x + 3y = 0
-x - 2y = 7 / * 5
5x + 3y = 0
-5x - 10y = 35
_____________________
3y - 10y = 35
-7y = 35 / : (-7)
y = -5
5x + 3y = 0
5x + 3 * (-5)
5x = -15 / : (-5)
x = -3