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Need help with these proportions

Need help with these proportions-example-1

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Remark

You need to do the bottom left to the upper right.

And then you need to do top left to bottom right.


Cross multiply

2. 7 * 3 = 5*x Combine the left

21 = 5x Divide by 5

21 / 5 = x

x = 4 1/5

x = 4.2


4.

7 * 7 = 8n combine the left

49 = 8n Divide by 8

49/8 = n

n = 6 1/8

n = 6.125


6 This one is a bit harder. But the rules are the same.

7*5 = 10*(b + 5) Notice you put brackets around b + 5

35 = 10b + 50 The plus remains. The 10 multiplies both the b and the 5

35 - 50 = 10b You have subtracted 50 from both sides.

- 15 = 10b Divide by 10

- 15/10 = b

b = - 1.5 This is a good question to study.




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