If `((3,-2),(-1,2))((x),(y))=((11),(-5))`, then `3x+7y=`

Simplify : (i) (5x - 9y) - (-7x + y) (ii) (x^(2) -x) -(1)/(2)(x - 3 + 3x^(2)) (iii) [7 - 2x + 5y - (x -y)]-(5x + 3y -7) (iv) ((1)/(3)y^(2) - (4)/(7)y + 5) - ((2)/(7)y - (2)/(3)y^(2) + 2) - ((1)/(7)y - 3 + 2y^(2))

The solution of the linear system of equations [{:(2,2,3),(7,1,1),(0,6,5):}][{:(x),(y),(z):}]=[{:(3y+11),(6z-1),(5y+11):}]+[{:(x),(x),(4z):}]+[{:(z),(3x),(4y):}]is

If 4x+5y=83 and (3x)/(2y)=(21)/(22), then y-x=?( a) 3( b) 4 (c) 7 (d) 11

If (5x+7y):(3x+11y)=2:3 , then find x:y.

Solve for x and y (i) [{:(,2,5),(,5,2):}] [{:(,x),(,y):}]=[{:(,-7),(,14):}] (ii) [x+y, x-4] [{:(,-1,-2),(,2,2):}]=[-7, -11] (iii) [{:(,-2,0),(,3,1):}] [{:(,-1),(,2x):}] +3[{:(,-2),(,1):}]=2 [{:(,y),(,3):}] .

if (3x-2y):(5x-7y)=5:3 then, find x:y.