Question

Given that y is inversely proportional to x, and y = 5 when x = 7, find the value of x when y = 70

Answer 1

5/7 = 70/X

5X= 490

X=98

Answer 2

x:y=7:5
7/5=x/70     (multiply both sides by 5)
7=5x/70     (multiply both sides by 70)
490=5x     (divide both sides by 5)
98=x