x+7y=10;3x-2y=7

Solve the following system of equations by matrix method : 5x+7y+2=0 4x+6y+3=0 5x+2y=3 3x+2y=5 3x+4y-5=0 x-y+3=0 3x+y=19 3x-y=23 3x+7y=4 x+2y=-1 3x+y=7 5x+3y=12

If 3x-7y=10 and xy=-1, find the value of 9x^(2)+49y^(2)

If 3x+5y=15 and x-2y=10 , what is the value of 2x+7y ?

Solve: 2x-7y=7 , 3x+y=22

The equation of the ellipse with focus (-1,1) directrix x-y+3=0 and eccentricity is a. 7x^2+2x y+7y^2+10 x+10 y+7=0 b. 7x^2+2x y+7y^2+10 x-10 y+7=0 c. 7x^2+2x y+7y^2+10 x-10 y+7=0 d. None of these

If 3x-7y=10\ and x y=-1, find the value of 9x^2+49 y^2

Express y in terms of x in the expression 3x – 7y = 10

If x = 10a, y = 3b , z = 7c and x : y : z = 10 : 3 : 7 , then (7x + 2y + 5z)/(8a + b + 3c) =