y=-x+7," at "x=4

Solve the following equation by the substitution method. 2x+y=7" and "4x-3+1=0

By using inverse of a matrix, solve the following equations: 2x+5y = 7 , x+3y = 4

Solve the following by Cramer's rule : 5x-y=9, 3x+y=7, x+y+z=4

The area of the parallelogram formed by the lines 3x+4y=7a;3x+4y=7b;4x+3y-7c and 4x+3y=7d is-

For solving the following sikmultaneous equations by Cramer's rule, find the values of D_x and D_y : 3x - y = 7, x + 4y = 11

For solving the following sikmultaneous equations by Cramer's rule, find the values of D_x and D_y : 3x - y = 7, x + 4y = 11

The equation to a pair of opposite sides of a parallelogram are x^2-5x+6=0 and y^2-6y+5=0 . The equations to its diagonals are (a) x+4y=13 ,y=4x-7 (b) 4x+y=13 ,4y=x-7 (c) 4x+y=13 ,y=4x-7 (d) y-4x=13 ,y+4x-7

Given that x:y= 2:7, find 3x + 4y: 2x + 5y.

For solving the following simultaneous equations by Cramer’s rule, find the value of D_(x) and D_(y) : 3x – y = 7, x + 4y = 11.

Solve 4/x+5y=7 and 3/x+4y=5