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2x+5y=9
2y=12-5x
y=6-2½x
2x+5*(6-2½x)=9
2x+30-12½x=9
2x-12½x=9-30
2x-12½x=-21
-10½x=-21 /-10½
x=2
y=6-2½*2
y=6-5
y=1
x+4y=12
4x+y=18
x=12-4y
4*(12-4y)+y=18
48-16y+y=18
-15y=18-48
-15y=-30 /-15
y=2
x=12-4*2
x=12-8
x=4