bolo de ovos: x
bolo de chocolate: x + 2
15x + 5 (x + 2) = 310
15x + 5x + 10 = 310
15x + 5x = 310 - 10
20x = 300
x = 300/20
x = 15
bolo de ovos: R$15,00
bolo de chocolate: 15 + 2 = R$17,00
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bolo de ovos: x
bolo de chocolate: x + 2
15x + 5 (x + 2) = 310
15x + 5x + 10 = 310
15x + 5x = 310 - 10
20x = 300
x = 300/20
x = 15
bolo de ovos: R$15,00
bolo de chocolate: 15 + 2 = R$17,00