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Alexxx [7]
3 years ago
13

If y=1.8 when x=-0.18 what is y when x= 0.51

Mathematics
1 answer:
GaryK [48]3 years ago
7 0
You can set it as a proportion:

\frac{x_1}{y_1} = \frac{x_2}{y_2}

\frac{-0.18}{1.8}  = \frac{0.51}{y_2}

Cross multiply:

-0.18y = 0.918

Divide:

y = -5.1
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So, you have to have your equation in terms of dimes. What you said about what he has: four more nickels than dimes in his pocket. Will help with our equation.
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We don't know how many dimes are in his pocket, since we're trying to solve it.
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.1x + (4+x).05=1.25
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.15x + .2 = 1.25; Subtract .2 from both sides.
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11(.05) +.1(7) = 1.25
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Now that we've tried it, we know there are 7 dimes in his pocket.
Tell me if this helps!
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