Question

a) 3x+2y P/ x=5 e y=3

b) 9x-4y P/ x=6 e y=2

c) 10x+12 P/x=4

d) 9y-y P/y=7

e) 15y+50x P/y=2 e x=1

f) 20x+15y P/x=3 e y=2

Answer 1

$a)3x + 2y = \\ 3 \times 5 + 2 \times 3 = \\ 15 + 6 = \\ 21 \\ \\ b)9x - 4y = \\ 9 \times 6 - 4 \times 2 = \\ 54 - 8 = \\ 46 \\ \\ c)10x + 12 = \\ 10 \times 4 + 12 = \\ 40 \ + 12 = \\ 52 \\ \\ d)9y - y = \\ 9 \times 7 - 7 = \\ 63 - 7 = \\ 56 \\ \\ e)15y + 50x = \\ 15 \times 2 + 50 \times 1 = \\ 30 + 50 = \\ 80 \\ \\ f)20x + 15y = \\ 20 \times 3 + 15 \times 2 = \\ 60 + 30 = \\ 90$

Espero ter ajudado!