You are going to make a large poster for a school project. To prepare, you make a scale drawing of the poster before creating the real thing. The dimensions of the scale drawing are 4 inches by 9 inches. The dimensions of the real poster will be 20 inches by 45 inches. What is the scale factor?

5

Step-by-step explanation:

You are going to make a large poster for a school project. To prepare, you make a scale drawing of the poster before creating the real thing. The dimensions of the scale drawing are

The dimensions of the real poster will be 20 inches by 45 inches.

The dimensions of the scale Drawing

= 4 inches by 9 inches.

We can see the inches of the real poster increased from the one of the scale drawing

The scale factor is calculated as:

20 ÷ 4/45 ÷ 9

= 5/ 5

Hence, the scale factor is 5

Both the width and length of the scale drawing was multiplied by 5 to get the length of the real poster

5+2x=a

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