Question

1.Wpisz brakujące liczby
a. x-3y=5 I×(-4)
4x = 5 y = 1

-4x + ... y = ...
4x+5y=1
...y= ...
y=...

x-3y=5
x=5+3×...
x=...

x=...
y=...


b. 0,3x+1,5y=5 I×2
1,5x+y = -1 I× (-3)

...x+...y=...
...x+...y=...

...x=...
x=...

1,5x +y= -1
y=...
y=...

x=...
y=...

Answer 1

A. x-3y=5 I×(-4)
4x + 5y = 1

-4x + 12 y = -20
4x+5y=1
17y= -19
y=-19/17

x-3y=5
x=5+3×y
x=5-(57/17)

x=28/17
y=-19/17


b. 0,3x+1,5y=5 I×2
1,5x+y = -1 I× (-3)

0,6x+3y=10
-4,5x+(-3)y=3

-3,9x=13
x=-3⅓

1,5x +y= -1
y=-1-(3/2)x
y=-1-(3/2)*(-10/3)

x=-10/3
y=-1+5=4