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2x + 5y = 7250 x3 6x + 15y = 21750 -
-11y = - 13750
y = 1250
3x + 2y = 4000
3x + 2. 1250 = 4000
3x = 4000-2500
x = 1500 /3
x= 500
3x+12y = 3x500 + 12x1250
= 1500 + 15000
= 16500
3p + 2b = 4.000 / x5 / 15p + 10b = 20.000
2p + 5p = 7.250 / x2 / 4p + 10b = 14.500
11p = 5.500
p = 500
3p + 2b = 4.000 / x2 / 6p + 4b = 8.000
2p + 5p = 7.250 / x3 / 6p + 15b = 21.750
-11b = - 13.750
b = 1.250
3p + 12b = 3(500) + 12(1.250)
= 1.500+ 15.000
= 16.500