Equations: 2965

Solve a system of equations:

x + 4y = -1
y = -1

Correct answer:

x =  3
y =  -1

Step-by-step explanation:


x+4y = -1
y = -1

x+4·y = -1
y = -1

x+4y = -1
y = -1


y = -1/1 = -1
x = -1-4y = -1-4 · (-1) = 3

x = 3
y = -1

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