x + y = 78
y = 3*(90 - x)/4
y = (270 - 3x)/4
4y = 270 - 3x
4x + 4y = 312
4x + 270 - 3x = 312
x = 312 - 270 = 42
y = 78 - 42 = 36
pronto
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Verified answer
x + y = 78
y = 3*(90 - x)/4
y = (270 - 3x)/4
4y = 270 - 3x
4x + 4y = 312
4x + 270 - 3x = 312
x = 312 - 270 = 42
y = 78 - 42 = 36
pronto