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Daca 2x+3y=19, atunci 7+4x+6y=?

Răspuns :

2x+3y=19
2*(2x+3y)=2*19
2*2x+2*3y=38
4x+6y=38
7+4x+6y=7+38
7x+4x+6y=45
2x+2y=19
7+4x+6y=?

4x+6y=2(2x+3y)
4x+6y=2x19
4x+6y=38
7+4x+6y=7+38=45