Question

can someone show me work?
Can someone please help? Solve the system by substitution.
-4.5x-2y=-12.5
3.25x-y=-0.75

Answer 1

Multiply the second equation by 2:
(3.25x-y=-0.75) x 2 =6.5x -2y=-1.5

Now subtract this new equation from the first one to eliminate y, i.e:
-4.5x-2y=-12.5
-(6.5x -2y=-1.5)

=>-11x+0=-11
x=-11/-11=1

put x back into the first eqn:

-4.5(1)-2y=-12.5
-4.5-2y=12.5
-2y=12.5+4.5
y=-8.5

so,
x=1, y=8.5.

Answer 2

thank you so much!! I relly appreciate it!! (:

Answer 3

you're welcome! :)

Answer 4

wait when you subtract the -2 from the two wouldnt you get 4?

Answer 5

the -2y - 2y isnt that 4?

Answer 6

No, it's -2y-(-2y)=-2y+2y=0

Answer 7

ohhhh i see what you mean! Im sorry i got confused for a second! thank you again!

Answer 8

that's alright :)