Answer:
Therefore the required resulting equation is

6 x minus 15 y = negative 63. 
Negative 15 x + 15 y = 90
Step-by-step explanation:
Given:
 ......................Equation ( 1 )
         ......................Equation ( 1 )
 ......................Equation ( 2 )
         ......................Equation ( 2 )
To Find:
Expression after multiplying to eliminate y term,
Solution:
So to eliminate 'y' term we need to multiply equation 1 by a constant 3 and equation 2 by a constant -5,  such that equations  becomes
 .....( 1 )
 .....( 1 )
 .....( 2 )
  .....( 2 )
so now by adding new equation one and two we can eliminate y term that means -15y and +15y will get cancel,
Therefore the required resulting equation is

6 x minus 15 y = negative 63. 
Negative 15 x + 15 y = 90