Question

2x-5y=3
3x-5y=7
solve using elimination method

Answer 1

2x-5y=3 -(1)
3x-5y=7 -(2)
(2) - (1):
(3x-5y) - (2x-5y) = 7-3
x = 4
Can you solve y?

Answer 2

1

Answer 3

first equation is 2x-5y=3

and second one is 3x-5y=7

now we need to eliminate either x or y. If you can see both are -5y so it is easier to eliminate y

Multiply one of the equations with (-)

2x-5y=3

-(3x-5y=7) -3x+5y=-7

add both equations

2x-5y=3
+
-3x+5y=-7

-x=-4

x=4

plug this in either one of the equations

2x-5y=3

2(4)-5y=3

-5y=-5y

y=1

answer :D

Answer 4

how about
2x-5y=18
-6x+5y=14

Answer 5

This time, add the 2 equations together :) Can you try?

Answer 6

2 -5 3
3 -5 7


2 -5 3
0 5 5


now back substitution
5y=5 : y=1

x=4



method called guasse's method


got?

Answer 7

x= -4

Answer 8

2x-5y=18 -(1)
-6x+5y=14 -(2)
(1)+(2)
(2x-5y) + (-6x+5y) = 18 +14
-4x = 32
x=?

Answer 9

that was supposed to be -6x+5y=-14

Answer 10

my bad

Answer 11

2x-5y=18 -(1)
-6x+5y=-14 -(2)
(1)+(2)
(2x-5y) + (-6x+5y) = 18 +(-14)
-4x = 4
x=?

Answer 12

so when adding i get -4x=4... divid 4 by -4... x =-4

Answer 13

4 /( -4) =?

Answer 14

o im retarded x=-1

Answer 15

Yes :) and can you do y?

Answer 16

y=-4

Answer 17

I got the same answer as yours :)