20 points!! Pls help

Step-by-step explanation:

-x-3=y, therefore x = -y-3

-3x - 8y = 4

Find the value of y

Substitute the x in -3x - 8y = 4 with -y-3

We get

-3(-y-3) - 8y = 4

3y + 9 - 8y = 4

-5y = 4-9

-5y = -5

Find the value of x

x = -y-3

x = -1-3

#IndonesianPride - kexcvi

240 units²

Further explanation

Given:

1. A rectangle with length = 20 units and width = 10 units.

2. Isosceles triangle with base = 20 units and height = 4 units.

Question:

Find the total area of the shape shown below.

The Process:

Step-1: find out the area of rectangular

The area = length x width

The area = 20 x 10

Hence, the area of rectangle is 200 units².

Step-2: find out the area of isosceles triangle

The area =

The area =

The area = 10 x 4

Hence, the area of triangle is 40 units².

Step-3: find out the total area

Let us calculate the sum of the area of rectangles and triangles.

Total area = 200 units² + 40 units²

Thus, the total area of the shape shown is 240 units².

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Notes

If we want to calculate the total circumference, the length of the hypotenuse of the triangle must be determined through the Pythagorean Theorem.

Learn more

What is the area of triangle ABC  

Find out the area of a cube  

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Hope I Helped