Question

solve this system of linear equations
separate the x- and y-values with a comma

-7x+6y=-5
2x+4y=-10

Answer 1

i wonder if we can multiply the top by 2 and solve that way

Answer 2

that sounds....plausible. lets try it!

Answer 3

-7x+6y=-5 ; *2
2x+4y=-10

-14x+12y=-10
2x+ 4y=-10
--------------
-12x+16y= 0 ; prolly not

Answer 4

doh!! forgot to do real math on it

Answer 5

woah buddy, this is no place for real math!

Answer 6

-7x+6y=-5 ; *2
2x+4y=-10

-14x+12y=-10
2x+ 4y=-10

-14x+12y= 2x+4y

-14x-2x+12y-4y= 0

-16x +8y = 0

8y = 16x

y = 2x ; if anything y might be twice x

Answer 7

-7x+6y=-5 ; *2/7
2x+4y=-10

-2x+12y/7 =-10/7
2x+4y=-10

-2x+12y/7 =-10/7
2x+28y/7 =-70/7
------------------
40y/7 = -80/7

y = -2 ?

Answer 8

which may mean that x = -1

-7(-1)+6(-2)=-5
2(-1)+4(-2)=-10

7 -12 =-5
-2 -8=-10

lol .. it does

Answer 9

yea it wuz that da answer was -1,-2

Answer 10

thanks