Question

If y varies jointly with p and q. When p = 3 and q = 3, y = 90, how do you find y when p = 7 and q = 5?

Answer 1

`y=350`

Explanation:

`"the initial statement is "yproppq`

`"to convert to an equation multiply by k the constant"`
`"of variation"`

`rArry=kpq`

`"to find k use the given condition"`

`"when "p=3" and "q=3,y=90`

`y=kpqrArrk=y/(pq)=90/(3xx3)=10`

`"equation is " color(red)(bar(ul(|color(white)(2/2)color(black)(y=10pq)color(white)(2/2)|)))`

`"when "p=7" and "q=5`

`rArry=10xx7xx5=350`