Eva

When Eva bought eight packages of cookies, 4 CZK left her. If she wanted to buy ten packages, she would have to borrow 20 CZK. How much money has Eva in her wallet?

Correct answer:

x =  100

Step-by-step explanation:


8y = x-4
10y = x+20

8·y = x-4
10·y = x+20

x-8y = 4
x-10y = -20

Row 2 - Row 1 → Row 2
x-8y = 4
-2y = -24


y = -24/-2 = 12
x = 4+8y = 4+8 · 12 = 100

x = 100
y = 12

Our linear equations calculator calculates it.



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