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ACT Math : How to find the solution to a rational equation with LCD

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Example Questions

Example Question #1 : How To Find The Solution To A Rational Equation With Lcd

John, Jill, and Jack are splitting a pizza. John eats 1/2 of the pizza and Jill eats 1/3 of the pizza. How much of the pizza is left for Jack?

Possible Answers:

3/5

1/6

1/5

1/3

None

Correct answer:

1/6

Explanation:

We can write an equation for the amount of pizza eaten, with as the amount left for Jack.

$\frac{1}{2} + \frac{1}{3} + x = 1$

To solve this equation, we must find the lowest common denominator of 1/2 and 1/3 . We can list the multiples of and to find the least common multiple:

2: 2, 4, 6, 8, 10, 12, ...

3: 3, 6, 12, 15, 18, 21, ...

We can see that the least common multiple of and is , so we can rewrite each of the fractions with a denominator of .

$\frac{1}{2}\cdot \frac{3}{3} = \frac{3}{6}$

$\frac{1}{3}\cdot \frac{2}{2} = \frac{2}{6}$

When we put these fractions back into the equation, we can solve for :

$\frac{3}{6} + \frac{2}{6} + x = 1$

$\frac{5}{6} + x = 1$

$x = \frac{1}{6}$

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Example Question #1 : How To Find The Solution To A Rational Equation With Lcd

What is the slope of a line represented by the equation:

15y + 3x = 4

Possible Answers:

$\frac{4}{3}$

$\frac{3}{4}$

$-\frac{1}{5}$

$\frac{1}{5}$

Correct answer:

$-\frac{1}{5}$

Explanation:

To solve problems where you need to find the slope of a line in a given equation, change the equation so that it matches y-intercept form:

y=mx+b

For this equation, first move the 3x over to the other side of the equation.

15y + 3x = 4

-3x -3x

The equation should now look like this:

15y = -3x + 4

Then, divide by 15 to isolate the variable .

$\frac{15y}{15} =-\frac{3x}{15} + \frac{4}{15} \rightarrow y =-\frac{3}{15}x + \frac{4}{15}$

Then simplify

$y =-\frac{3}{15}x + \frac{4}{15} \rightarrow y =-\frac{1}{5}x + \frac{4}{15}$

Whatever number is before the x in the equation (m) is your slope.

$-\frac{1}{5}$

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Example Question #102 : Equations / Inequalities

Rational_5

Possible Answers:

–1

–2

Correct answer:

Explanation:

Rational_2

Rational_3

Rational_4

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Example Question #51 : Algebra

Linesmb1

Possible Answers:

–b/(m²– 1)

–b/(m + 1)

bm/(m²+ 1)

b/(m²+ 1)

–bm/(m²+ 1)

Correct answer:

b/(m²+ 1)

Explanation:

Linesmb5

Linesmb4

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Example Question #401 : Algebra

In the equation below, , , and are non-zero numbers. What is the value of in terms of and ?

$\frac{1}{m^3}-\frac{1}{k^2}=\frac{1}{p}$

Possible Answers:

$m=(\frac{p+k^2}{pk^2})^{\frac{1}{3}}$

$m=\frac{p^2k^3}{p+k^2}$

$m=(\frac{p+k^2}{2})^3$

$m=(\frac{pk^2}{p+k^2})^{\frac{1}{3}}$

$m=p^{\frac{1}{2}}-k^{\frac{1}{3}}$

Correct answer:

$m=(\frac{pk^2}{p+k^2})^{\frac{1}{3}}$

Explanation:

Pkm_7-21-13

Pkm2_7-21-13

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ACT Math : How to find the solution to a rational equation with LCD

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #1 : How To Find The Solution To A Rational Equation With Lcd

Example Question #1 : How To Find The Solution To A Rational Equation With Lcd

Example Question #102 : Equations / Inequalities

Example Question #51 : Algebra

Example Question #401 : Algebra

All ACT Math Resources

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