Question

- 4x + 5y = - 3615x – 3y = 32​

Answer 1

Answer:

x=6/7, y=-228/35

Explanation:

-4x+5y = -36 /*3

15x-3y = 32  /*5

------------------------- here we multiply both equations to get common y

-12x+15y = -108

75x-15y = 160

------------------------- then we add these two equations to eliminate the y

-12x+75x+15y-15y = 54

63x = 54

------------------------- then we get the x

x = 54/63

x = 6/7 (after we divide both with 9)

------------------------ next up, we add the value of x in first equation

-4 * 6/7 + 5y = -36

-24/7 + 5y = -36

------------------------ we leave 5y on the left side

5y = -36 + 24/7

5y = -252/7 + 24/7

-------------------------- common divider is 7 so we multiply 36*7=252

5y = -228/7

y= -228/7/5/1

------------------------- now we leave only y on the left side

y = -228*1/7*5

y = -228/35

------------------------- when dividing the fragment we multiply outer and inner