How i solve this 2 queation in matrix .

1 - Solve the folloeing equation for I1 , I2 , I3 using Matrix Inverse method

I1 - I2 + I3 = 0

I1 + I2 = 10

I2 + 2I3 = 10

Is this first step are correct :

(1 - 1 1) (I1) = (0 )

(1 1 0) (I2) = (10 )

(0 1 2 ) (I3) = (10)

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Q2 : Check for conisitency

a ) 2X + 3y = 5 , 4X + 6y = 7

B ) 4X - 3y = 8 , 2X + 4y = 6

C )3x + 5Z = 9 , 3X - Z = 5

How i can solve like this 2 quetions

please i want help