Question 696646
 1)2x-5y=11 (adding)
  -2x +3y=-9
 => -2y=2
 =>y=-1
 then: 2x=11+5y 
         =11+5(-1)
         =11-5
       2x=6
        x=3
for checking:2x-5y==11
             2(3)-5(-1)
             6+5=11

2)5y-10x=-15
  5y=-15+10x  (dividing 5 on both sides)
   y=-3+2x
   y=2x-3
   slope is 2

3) x^2-10x-24
x^2-12x+2x-24
x(x-12)+2(x-12)
(x+2)(x-12)

4)(3x-2)(x+4)
  3x(x+4)-2(x+4)
  3x^2+12x-2x-8
  3x^2+10x-8

5) 2(3y-4)
 it can be done by putting the equation equal to 0
  2(3y-4)=0
   3y-4=0
   3y=4
    y=4/3