Question

@timo86m
10x - 7y = -1
-2x -7y = -25

Answer 1

thid they ask what method to use?

Answer 2

did*

Answer 3

huh ?

Answer 4

i assume you can use any method then since they haven't explained them. THere are substitution method, and elimination and i think combination.

Answer 5

I think for finding (x,y) you subtract ??

Answer 6

10x - 7y = -1
-2x -7y = -25

what i'd do is solve for y in 10x - 7y = -1

then you'd have it in a form of y=expression

then plug in that expression in the y of the bottom equation

2x-7(expression)=-25 from there you can solve for x. once you solve for x you can use that number to solve for y by pluggin in the found value of x into either bottom or top equation.

Answer 7

If you didn't understand that then lets do it one at time. Solve for y in 10x - 7y = -1

Answer 8

one way I know of doing this is subtract the equations by eachother so,

10x - 7y = -1
- -2x -7y = -25

Answer 9

that works also and you would actually add it to cancel the -7y

Answer 10

so

10x - 7y = -1
+( -2x -7y = -25)

Answer 11

hmm.. I don't know D:

Answer 12

10x - 7y = -1
+( -2x -7y = -25)

first distribute the +

10x - 7y = -1
2x +7y = +25 <- now distributed


now we can add just add the columns
10x - 7y = -1
2x +7y = +25
----------------------
12x =24


so now that u added +( -2x -7y = -25) into row 1 you got

12x =24
-2x -7y = -25


you have successfully elimanted y.


12x =24
-2x -7y = -25



from here it is easy to find x..

x=24/12= 2

so

bottom row is

-2(2)-7y=-25 just solve for y and you are done.

Answer 13

thanks can you help me with this one last problem ?

Answer 14

sure start a new one. Close this one.