Posted by **Linda** on Monday, March 10, 2008 at 6:48pm.

5x=1/2y-1, find value of X; 1/4y=10x-1, find value of Y (use substitution)

- Algebra -
**Damon**, Monday, March 10, 2008 at 7:05pm
I assume you mean:

5 x = (1/2) y - 1

(1/4) y = 10 x - 1

and we are to solve the two equations simultaneously using substitution and get for x first

so solve the first for x as a function of y

x = (1/10) y - 1/5

use that x in the second equation to get y

(1/4) y = 10 [ (1/10)y -1/5 ] - 1

y = 4 y - 8 - 4

3 y = 12

y = 4

Now use that value of y to get x

5 x = (1/2) 4 - 1

x = 1/5

- Algebra -
**kels**, Tuesday, July 12, 2011 at 1:05pm
i need help in finding this answer

find the value of r so that the line through (8,R) and (4,5) has a slope of negative

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