Posted by **SraJMcGinn** on Monday, May 21, 2007 at 9:21pm.

First: solve for k. Then, go back to the original equation c=k(d-3) and solve for c when d is ten.

Second: Area=k*s^2

Put in the fist conditions, solve for k.

Then, knowing k, solve for A when is eight.

direct variation

1)if c varies directly as d-3, and if c=16 when d=7, find c when d=10

c=k(d-3) then 16=k(4)...how do u do this?

2)the surface area of a cube varies directly as the square of the length of one edge. if the surface area of a cube is 150 cm squared when the length of an edge is 5 cm, what is the surface area of a cube with an edge of length 8 cm?

## Answer this Question

## Related Questions

- Substitution Method-Plz help - Use the Substitution method to solve the system ...
- subsitution method - Can some one show me how to use the Substitution method to ...
- ALGEBRA 1!PLZ HELP! - Use the Substitution method to solve the system of ...
- Algebra - To solve the system of equations, which expression could be ...
- Algebra 1 - What is an equation of a line perpendicular to the line with ...
- Algebra - 5. Find the x and y intercepts of each linear equation. Be sure to ...
- Algebra1!Plz help I have test 2morrow!!! - so would the new eqaution be... 2x+8=...
- Physics/Science - A startled armadillo leaps upward rising 0.547 m in the first ...
- Math- Algebra - hi wat method would i use and how would i solve this system of ...
- algebra - solve by substitution 5x-2y = -5 y - 5x = 3 could someone take a min a...