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5 votes
X = 8, y = 20. Find y when x = 42

2 Answers

6 votes
8 / 20 = 42 / y;
Then, y = ( 42 × 20 ) / 8 ;
y = 840 / 8 ;
y = 105;
User JohnJohnGa
by
7.7k points
7 votes
Create proportions to do this question
When x is 8, y is 20
when x is 42, y is ?


(8)/(20) =
(42)/(?)

Do cross multiplication:

8 × ? = 20 × 42
8 × ? = 840

Divide by 8 to isolate the unknown


(8*?)/(8) =
(840)/(8)
8 and 8 cancels out

? = 105

y is 105 when x is 42
User Neworld
by
7.9k points

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