3y+7=x 5x+4y=-3 x=? y=?

x=-1,\:y=4

Step-by-step explanation:

x = 1

y = -2

Step-by-step explanation:

3y + 7 = x

5x + 4y = -3

Let's use substitution method, plug in the top equation x into the bottom one

5(3y + 7) + 4y = -3

15y + 35 + 4y = -3

19y + 35 = -3

Subtract 35 from both sides

19y + 35 = -3

     - 35    - 35

19y = -38

Divide both sides by 19

19y/19 = -38/19

y = -2

Plug in the new y into one of the original equations, I'll use the top one

3(-2) + 7 = x

-6 + 7 = x

x = 1

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7