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iris [78.8K]
4 years ago
14

three bags of potatoes and four cases of corn cost $40. Five bags of potatoes and two cases of corn cost $34. Find the cost of o

ne bag of potatoes and the cost of one case of corn.
Mathematics
2 answers:
MAXImum [283]4 years ago
8 0
Use variables and set up equations.

3p + 4c = 40 \\ 5p + 2c = 34

Next, get one variable with equal coefficients.

3p + 4c = 40 \\ 10p + 4c = 68\ (multiplied\ both\ sides\ by\ 2)

Then get it alone on one side.

4c = 40-3p \\ 4c = 48-10p

Now we can use substitution. Since 40-3p = 4c, substitute 40-3p for 4c in the other equation and you'll get an equation with just one variable to simplify and solve.

40-3p = 68-10p \\ 40+7p = 68 \\ 7p = 28 \\ \boxed{p = 4}

We can then use p = 4 in an earlier equation to find c.

5p + 2c = 34 \\ 5*4 + 2c = 34 \\ 20 + 2c = 34 \\ 2c = 14 \\ \boxed{c=7}

bezimeni [28]4 years ago
8 0
3p + 4c = 40 ⇒ 15p + 20c = 200
5p + 2c = 34 ⇒ <u>15p +   6c = 102</u>
                                    <u>14c</u> = <u>98</u>
                                     14     14
                                        c = 7
                            5p + 2(7) = 34
                              5p + 14 = 34
                              <u>      - 14  - 14</u>
                                      <u>5p</u> = <u>20</u>
                                       5      5
                                        p = 4
                                  (p, c) = (4, 7)
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