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7x-3y=15
5x+6y=27
7x-3y=15 /*2
14x-6y=30
_____________
19x=57 /:19
x = 3
7*3-3y=15
21-3y=15
-3y=15-21
-3y=-6 /:(-3)
y=2
x=3
7x- 3y = 15 // ×2
5x + 6y = 27
14x- 6y=30
5x+ 6y= 27
19x= 57 // :19
5x + 6y= 27
x= 3
6y= 27 - 5x
6y = 27 - 5×3
6y= 27 - 15
6y= 12 // :6
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7x-3y=15 /*2
5x+6y=27
14x-6y=30
5x+6y=27
_____________
19x=57 /:19
x = 3
7x-3y=15
7*3-3y=15
21-3y=15
-3y=15-21
-3y=-6 /:(-3)
y=2
x=3
y=2
7x- 3y = 15 // ×2
5x + 6y = 27
14x- 6y=30
5x+ 6y= 27
19x= 57 // :19
5x + 6y= 27
x= 3
6y= 27 - 5x
x=3
6y = 27 - 5×3
x=3
6y= 27 - 15
x=3
6y= 12 // :6
x=3
y=2