Question

Still not getting it:
x-4y=9
2x-3y=11

Answer 1

thats too bad

Answer 2

Why do you have to go and be a jerk? that uncalled for

Answer 3

x-4y=9
2x-3y=11

2x-8y=18
2x-3y=11

-5y=7
y=-5/7

x=9+4(-5/7)

Answer 4

Solve x-4y=9 for x

x-4y=9

x=9+4y

---------------------


Now move onto the second equation


2x-3y=11


and plug in x = 9+4y (what we just solved for above)


2(9+4y)-3y=11


Now solve for y


2(9+4y)-3y=11


18+8y-3y=11


5y+18=11


5y=11-18


5y=-7


y=-7/5


Now go back to x=9+4y and use y=-7/5 to find x


x=9+4y


x=9+4(-7/5)


x=9-28/5


x=45/5-28/5


x=17/5



So the solutions are x=17/5 and y=-7/5

Answer 5

multiply 1st equation by 2

2(x-4y=9)------>2x-8y=18

subtract 2nd equation from 1st

2x-8y=18
-2x+3y=-11
------------
-5y=7
y=-7/5

now plug y into one of the equation

x-4(-7/5)=9
x+(28/5)=9
x=9-(28/5)
x=(45-28)/5
x=17/5

therefore,x=17/5 and y=-7/5