3.x+y=10" and "5x-y=2

Find the equation of a straight line through the intersection of lines 3x+2y=10 and 5x-6y=2 and perpendicular to the line 4x-7y+13=0 .

x+y=10 ; 5x-3y=-6

Find y when 3x+10y=5 and x=2

Write the solution of the equation 5x-10y+5=0 and x-2y+1=0 .

The planes 2x -y+4z=5 and 5x-2.5y+10z=6 are

Angle of intersection of x^(2)+y^(2)-6x-2y-10=0 and y=2x-5

The planes 2x-y+4 z=5 and 5x-2.5y+10z=6 are