Question

Me ajudem,É para encontrar o valor de X e Y

Answer 1

b) 4x -4y = -9
2x +3y = 8(-2)

4x -4y = -9
-4x -6y = -16

-10y = -25
-y = -25/10
-y = -2,5(-1)
y = 2,5

4x -4(2,5) = -9
4x -10 = -9
4x = -10 -9
4x = -19
x = -19/4
x = -4,75

c) 3x -y = 7
x +y = 10

4x = 17
x = 17/4
x = 4,25

4,25 +y = 10
y = 10 -4,25
y = 5,75