Simple equations

Solve the system of equations:

5x+3y=5
5x+7y=25

Correct answer:

x =  -2
y =  5

Step-by-step explanation:


5x+3y=5
5x+7y=25

5·x+3·y=5
5·x+7·y=25

5x+3y = 5
5x+7y = 25

Row 2 - Row 1 → Row 2
5x+3y = 5
4y = 20


y = 20/4 = 5
x = 5-3y/5 = 5-3 · 5/5 = -2

x = -2
y = 5

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