dit. x dan y 1.5x + 3y = 7 3x - 5y = -23

5X+3y=7     dikali 3
3x-5y=-23   dikali 5

15x+9y=21
15x-25y=-115 -
    34y=136
       y= 136/34
        y= 4

5x+3y=7
5x+3(4)=7
5x+12=7
5x= 7-12
5x=5
x= -5/5
x=-1

5x + 3y = 7   l x 3l 15x + 9y = 21
3x - 5y = -23 l x 5l 15x - 25y = -115
34y = 136
y = 136/34
y = 4
5x + 3y = 7
5x + 3(4) = 7
5x + 12 = 7
5x = 7 - 12
5x = -5
x = -5 /5
x = -1