Question

7- Resolva o sistema a seguir
5(x+1)+3(y-2) = 4
8(x+1)+5(y-2)=9

Answer 1

5(x + 1) + 3(y - 2) = 4

5x + 5 + 3y - 6 = 4

5x + 3y = 5 <<<<<<<<<<<

8(x + 1) + 5(y - 2) = 9

8x + 8 + 5y - 10 = 9

8x + 5y = 11 <<<<<<<<<<

5x + 3y = 5 (* 5)

8x + 5y = 11 (* -3)

________________

25x + 15y = 25

-24x - 15y = -33

_______________

x = -8

5x + 3y = 5

5(-8) + 3y = 5

-40 + 3y = 5

3y = 5 + 40

3y = 45

y = 45/3

y = 15

BONS ESTUDOS!