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Help me I still don't understand this assignment

Help me I still don't understand this assignment-example-1

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The solution to the given system of equation is (-1, -1). This means the lines will intersect at (-1, -1)

Given the system of equations

y = 2x + 1

y = - 3x - 4

In order to determine the solution to the system of equation, we will equate both expressions to have:
2x + 1 = -3x - 4

2x + 3x = -4 - 1

5x = -5

Divide both sides by 5 to have:

5x/5 = -5/5

x = -1

y = 2(-1) + 1

y = -1

Hence the solution to the given system of equation is (-1, -1). This means the lines will intersect at (-1, -1)

Help me I still don't understand this assignment-example-1
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