Question

Solve the system of equations. *Will Medal*
-5x+4y=-8
-9x+5y=1

Answer 1

Method of cross multiplication is known to you?

Answer 2

yes but isnt that just used for fractions? I know for this we have to eliminate one of the variables...

Answer 3

well you can use one of the methods: 1st method:
from the first equation find x in terms of y and then substitute this x value in the second equation

Answer 4

then you will get a value of y..

Answer 5

can you show me how to do that? every time i try i get it wrong

Answer 6

Ok sure

Answer 7

1st equation :
-5x+4y=-8
so 5x=4y+8 implies x=(4/5)(y+2).

Answer 8

wait.. lets do it in an easier way

Answer 9

ok

Answer 10

I am giving you a general rule for one step solution

Answer 11

Suppose you have the following equations:
ax+by+c=0
dx+ey+f=0

Answer 12

then x/(bf-ec)=y/(cd-af)=1/(ae-db)

Answer 13

ok

Answer 14

first put the given equations in that form as I said

Answer 15

then you have
-5x+4y+8=0
-9x+5y-1=0

Answer 16

i see that

Answer 17

then use the general formula
x/(-4-40)=y/(-72-5)=1/(-25+36)

Answer 18

alrright

Answer 19

so x=(-44/11)=-4
y=(-77/11)=-7

Answer 20

so why dividing by 11?

Answer 21

see what er did...
check the coefficients
a b c
d e f

Answer 22

ohhhhhhh ok

Answer 23

for y , omit the second column and do the same thing.