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5x+4y=21,3 | *4
-20x -25y = - 105
20x+ 16y = 85,2
-9y = -19,8 | / -9
y= 2,2
x= 2,25
5x+4y=21,3 |*4
-20x-25y=-105
20x+16y=85,2
-20x-25y+20x+16y=85,2-105
-9y=-19,8
y=2,2
4x+5*2,2=21
4x+11=21
4x=10
x=2,5