Question

value of y when x=10

Answer 1

Answer:

Formula for direct variation is y=kx, where k represents the constant. So, we solve for "k" first given the "x" and "y" variables.

Read "y varies directly as x" when y=2, x=10:

2 = k(10)

2 /10 = k(10)/10

1/5 = k

Now that you found "k" you can substitute that into equation with the other given variables:

y = (1/5)(-25)= -5

Answer 2

Answer:

let x be 10

therefore in standard for x+y=0

therefore 10+y=0

after transposing

y= -10

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