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4x - 5y = 1     Subtract 4x from both sides

4x - 4x  - 5y = 1 - 4x

- 5t = 1 - 4x     Or more conventionally

-5x = -4x + 1    Divide by - 5

y = -4x/-5 + 1/-5

y = (4/5) x - 1/5  

Look at ∠A, the angle which resides on (1, 3). If we count 5 units down, you find the other endpoint on side AC. Hence, the length of side AC is 5 units. This figure is equal to the height of the graphed triangle.

If we mirror this process with the figure representing the triangle's length, side BC, we get 4 units.

The formula for calculating a triangle's area is . In this context, the base of the triangle is the same as the length. Now, let's plug in the base and the height.

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The area of triangle ABC is 10 squared units.