Avendor sells hot dogs and bags of potato chips. a customer buys 3 hot dogs and 3 bags of chips for $10.50. another customer buys 2 hot dogs and 4 bags of chips for $9.50. find the cost of a hot dog

Solution:

Let's us suppose the cost of 1 hot dog is x and the cost of 1 potato chip is y.

Now if we multiply equation 1 by 2 and equation2 by 3, and subtract equation 1 from second we have:

Equation 1 will become :

6x+6y=21

Equation 2 will become:

6x+12y=28.5

Now subtracting above two, we have:

6x+12y=28.5

6x+6y=21

6y=7.5

y=1.25

Now lets us substitute the value of y=1.25 in equation 1:

then we have:

3x+3(1.25)=10.5

x=2.25

Therefore the cost of a hot dog is $2.25

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1