If `b(x+2y)=60 and by=15`, what is the value of bx?

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

If 2x-3y=11 and 3x+15=0 , what is the value of y?

If y=ax^(2)+bx+c passes through the points (-3, 10), (0, 1), and (2, 15) , what is the value of a+b+c ?

If 2x+1=8 and 15-3y=0, what is the value of (x)/(y) ?

If (x - y)(x + y) = 15 and x + y = 5 , then what is the value of x//y ?

If 2x+y=17;y+2z=15 and x+y=9 then what is the value of 4x+3y+z?(a)41 (b) 43(c)45 (d) 55 (e) None of these

If the lines 3y + 4x = 1 , y = x + 5 and 5y + bx = 3 are concurrent, then what is the value of b?

If x=a sin theta and y=b cos theta, what is the value of b^(2)x^(2)+a^(2)y^(2)?