Friday

November 28, 2014

November 28, 2014

Posted by **Beth** on Tuesday, January 25, 2011 at 6:44am.

If y = 10 when x = −5, what is the value of y when x = 30?

- maths -
**Reiny**, Tuesday, January 25, 2011 at 8:43am"y is directly proportional to x" --- y = kx , where k is a constant

for the given:

10 = -5k

k = -2

so y = -2x is your equation:

so when x = 20 , y = ......

**Answer this Question**

**Related Questions**

maths - I'm stuck here don't have a clue what to do. I've read all my school ...

maths - I am trying to understand what to do here.. need help asap!! Thanks! M ...

Maths - I need help with the following if thats ok? Calculate the discriminant ...

maths - A ball is launched into the air from below a cliff. after t seconds its ...

maths - If a van travels for a distance of 18 km at an average speed of 75...

maths - If a car travels for a distance of 16 km at an average speed of 50...

chem - The following equilibrium pressures were observed at a certain ...

maths - I've put what i think are the answers at the bottom. Consider the ...

maths - The mass of a particular substance is known to grow exponentially at a ...

Maths - Please help!!! The mass of a particular substance is known to grow ...