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2a + 3b = 4a - b
3b + 7 = 1a - 3
-2a = -4b
3b-a = -10
a = 2b
3b-2b = -10
a=2b
b= -10
a= -20
b= -10
2.
x-y=2
½x-1=¼y /x4
x-y=2
2x-4=y
x-(2x-4)=2
2x-4=y
-x+4=2
2x-4=y
x=2
2x-4=y
x=2
4-4=y
x=2
y=0
3.
4x+3y=54
⅓x=4(1+⅛y)
4x+3y=54
⅓x=4+2y /x3
4x+3y=54
x=12+6y
4(12+6y)+3y=54
x=12+6y
48+9y=54
x=12+6y
9y=6
x=12+6y
y=⅔
x=12+6×⅔
y=⅔
x=16
Myślę, że jest ok ale radzę prześledzic obliczenia