Solving for 'a' Using Cross Products and Ratios

The video tutorial explains how to solve for 'a' using two methods: the cross products property and recognizing relationships between ratios. The first method involves multiplying and dividing to find the value of 'a'. The second method uses the concept of scaling ratios by division to achieve the same result. Both methods conclude that 'a' equals three.

What is the first step in solving for 'a' using the cross products property?

• Dividing by 6

• Multiplying 2 by 9

• Adding 2 and 9

• Subtracting 6 from 18

Tags

CCSS.HSA.REI.A.1

After multiplying 2 by 9, what is the next step in solving for 'a'?

• Dividing by 6

• Multiplying by 6

• Subtracting 6

• Adding 6

How can you go from 6 to 2 in the ratio method?

• By subtracting 4

• By multiplying by 3

• By dividing by 3

• By adding 4

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

What is the result of dividing 9 by 3 in the ratio method?

• 4

• 2

• 3

• 1

Tags

CCSS.4.MD.A.2

Which methods can be used to solve for 'a'?

• Adding and subtracting

• Cross multiply and divide

• Multiplying and adding

• Subtracting and dividing

Tags

CCSS.4.MD.A.2