Question

How do you find a b and c for
a=-b+3
a+2c=10
-b+c=3

Answer 1

Solve -b+c=3 for c to get

c = b+3

Answer 2

Now plug a = -b+3 into the second equation to get

a+2c=10

(-b+3)+2c=10

-b+3+2c=10

Then plug in c = b+3 to get

-b+3+2c=10

-b+3+2(b+3)=10

Solve this last equation for b. Tell me what you get.

Answer 3

What do you plug c=b+3 into?

Answer 4

into -b+3+2c=10

Answer 5

notice how I replaced 'c' with b+3

Answer 6

thanks

Answer 7

b=1?

Answer 8

yes good

Answer 9

you can now use this to find 'a' and 'c'

Answer 10

a=2

Answer 11

c=4

Answer 12

good

Answer 13

all 3 are correct

Answer 14

thanks!

Answer 15

yw