Question

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Answer 1

ok lets say
v is vanilla wafers and
c is chocolate wafers

Answer 2

vanilla costs $4
chocolate costs $1
and they buy v amount of vanilla and c amount of chocolate to get a total bill of $45

Answer 3

So we can make one equation out of that which is.

Answer 4

4v+1c=45

Answer 5

Yes but we still need to make the second equation.

Answer 6

ok so we know that in all she bought 27 wafers so
v+c=27

Answer 7

Do you get that?

Answer 8

So if we graph both of those two equations, we get
https://www.desmos.com/calculator/gc1tpaohjw

Answer 9

Verify that v = 6 and c = 21 .

Answer 10

Because desmos will only graph with x and y I made v to x and c to y.

Answer 11

And you will see that the two lines intersect at (6,21) and so then v=6 and c=21

Answer 12

Is demos a plotting system?

Answer 13

Desmos has a graphing calculator

Answer 14

Umm Yes @piercetheveil47 (6,21) is the point where the 2 lines intersect on the graph.

Answer 15

So basically @robtobey Yes.

Answer 16

You can include the graph and say that you graphed the lines and saw where they intersected.

Answer 17

You chose to solve it by graphing.

Answer 18

or kind of like I chose to solve it by graphing...

Answer 19

No problem @piercetheveil47 @~

Answer 20

From Mathematica v9. Refer to the attachment.