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y-nr gaini
7x=y
y-15=4(x+3)
7x-15=4x+12
7x-4x=12+15
3x=27 x=9 7*9=63-y
x = 7y
x-15 = 4(y+3)
Substituim x in a doua exuatie:
7y - 15 = 4y + 12
Grupam termenii similari:
3y = 27
y=9
x=7*9 ---> x=63
Deci are 63 gaini si 9 rate :)