Find `x ,\ y ,\ z\ a n d\ t` , if `2[x5 7y-3]+[3 4 1 2]=[7 14 15 14]`

Find x , y , z , t if 2[(x, z ),(y ,t)]+3[(1,-1),( 0, 2)]=3[(3, 5),( 4 ,6)] .

From the following equation, find the values of x and y: 2[[x,5],[7,y-3]]+[[3,4],[1,2]]=[[7,14],[15,14]]

The number of solutions of the system of equations x+y+z = 4, 2x + 5y – 2z = 3 and x + 7y – 7z = 5, is /are a)0 b)1 c)2 d)infinite

Find the angle between the planes : (i) 3 x - 6y - 2z = 7 " " 2x + y - 2z = 5 (ii) 4 x + 8y + z = 8 " " and y + z = 4 (iii) 2 x - y + z =6 " " and x + y + 2z = 7 .

(i) x=14-y. Find x ,If y=8 . (ii) y=x-2 . Find y ,if x=7 .

7 (y + 3) -2 (x + 2) = 14.4 (y-2) +3 (x-3) = 2