Direct Variation

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If y = -7 when x = -14, write the direct variation equation and find y when x = 20.

y = 0.5x; y = 10

If y = 10 when x = 9, write the direct variation equation and find x when y = 9.

y = 10/9x; x = 8.1

If y = 4.25 when x = 0.75, write a direct variation equation then find y when x = 4.5.

y = 17/3x ; 25.5

If y = 3.2 when x = 1.6, write a direct variation equation then find y when x = 19.

y = 2x ; 38

If y = 8 when x = 4, write the direct variation equation and find y when x = 5.

y = 2x; y = 10

If x = -7 when y = -14, write the direct variation equation and find y when x = 20.

y = 2x; y = 40

If y = 6 when x = 10, write a direct variation equation and find x when y =18.

y = 3/5x ; 30

If y = 27 when x = 6, write the direct variation equation and find x when y = 45.

y = 4.5x; x = 10

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