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PSAT Math : Algebra

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Example Questions

Example Question #434 : Algebra

If $x+1< 4$ and $y-2<-1$ , then which of the following could be the value of x+y ?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, add the two equations together:

$x+1<4$

$y-2<-1$

$x+1+y-2<4-1$

$x+y-1<3$

$x+y<4$

The only answer choice that satisfies this equation is 0, because 0 is less than 4.

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Example Question #1 : How To Find The Solution To An Inequality With Addition

If 17-x>19 , which of the following could be a value of ?

Possible Answers:

Correct answer:

Explanation:

In order to solve this inequality, you must isolate on one side of the equation.

17-x>19

17 > 19 +x

-2 > x

Therefore, the only option that solves the inequality is .

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Example Question #141 : Algebra

What values of make the statement $\left |5x-9 \right |\geq6$ true?

Possible Answers:

$x\geq4,x\leq -\frac{1}{2}$

$x\geq3, x\leq \frac{3}{5}$

$x\geq5,x\leq \frac{1}{5}$

$x\geq15,x\leq \frac{2}{5}$

$x\geq6,x\leq \frac{1}{3}$

Correct answer:

$x\geq3, x\leq \frac{3}{5}$

Explanation:

First, solve the inequality $5x-9 \geq6$ :

$5x-9 \geq6$

$5x\geq15$

$x\geq3$

Since we are dealing with absolute value, $5x-9\leq-6$ must also be true; therefore:

$5x-9\leq-6$

$5x\leq3$

$x\leq \frac{3}{5}$

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Example Question #52 : Equations / Inequalities

If –1 < n < 1, all of the following could be true EXCEPT:

Possible Answers:

(n-1)² > n

n² < 2n

16n² - 1 = 0

|n² - 1| > 1

n² < n

Correct answer:

|n² - 1| > 1

Explanation:

N_part_1

N_part_2

N_part_3

N_part_4

N_part_5

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Example Question #53 : Equations / Inequalities

(√(8) / -x ) < 2. Which of the following values could be x?

Possible Answers:

-2

-1

-3

All of the answers choices are valid.

-4

Correct answer:

-1

Explanation:

The equation simplifies to x > -1.41. -1 is the answer.

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Example Question #54 : Equations / Inequalities

Solve for x

$\small 3x+7 \geq -2x+4$

Possible Answers:

$\small x \geq -\frac{3}{5}$

$\small x \leq -\frac{3}{5}$

$\small x \geq \frac{3}{5}$

$\small x \leq \frac{3}{5}$

Correct answer:

$\small x \geq -\frac{3}{5}$

Explanation:

$\small 3x+7 \geq -2x+4$

$\small 3x \geq -2x-3$

$\small 5x \geq -3$

$\small x\geq -\frac{3}{5}$

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Example Question #55 : Equations / Inequalities

We have x^2-4<0 , find the solution set for this inequality.

Possible Answers:

x<2

x>2, x<-2

x=0

x>-2

-2<x<2

Correct answer:

-2<x<2

Explanation:

$x^2-4<0 \Rightarrow x^2<4 \Rightarrow -2<x<2$

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Example Question #25 : Inequalities

Fill in the circle with either $<$ , $>$ , or $=$ symbols:

$(x-3)\circ\frac{x^2-9}{x+3}$ for $x\geq 3$ .

Possible Answers:

None of the other answers are correct.

$(x-3)> \frac{x^2-9}{x+3}$

The rational expression is undefined.

$(x-3)=\frac{x^2-9}{x+3}$

$(x-3)< \frac{x^2-9}{x+3}$

Correct answer:

$(x-3)=\frac{x^2-9}{x+3}$

Explanation:

$(x-3)\circ\frac{x^2-9}{x+3}$

Let us simplify the second expression. We know that:

$(x^2-9)=(x+3)(x-3)$

So we can cancel out as follows:

$\frac{x^2-9}{x+3}=\frac{(x+3)(x-3)}{(x+3)}=x-3$

$(x-3)=\frac{x^2-9}{x+3}$

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Example Question #21 : Inequalities

What is the greatest value of that makes

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

a true statement?

Possible Answers:

228

277

Correct answer:

277

Explanation:

Find the solution set of the three-part inequality as follows:

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

$-45 \cdot (-6) \geq \frac{x - 7}{- 6} \cdot (-6) \geq - 22 \cdot (-6)$

$270 \geq x-7 \geq 132$

$270 + 7 \geq x-7 + 7 \geq 132 + 7$

$27 7 \geq x \geq 139$

The greatest possible value of is the upper bound of the solution set, which is 277.

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Example Question #5 : How To Find The Solution To An Inequality With Multiplication

What is the least value of that makes

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

a true statement?

Possible Answers:

139

125

Correct answer:

139

Explanation:

Find the solution set of the three-part inequality as follows:

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

$-45 \cdot (-6) \geq \frac{x - 7}{- 6} \cdot (-6) \geq - 22 \cdot (-6)$

$270 \geq x-7 \geq 132$

$270 + 7 \geq x-7 + 7 \geq 132 + 7$

$27 7 \geq x \geq 139$

The least possible value of is the lower bound of the solution set, which is 139.

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PSAT Math : Algebra

Study concepts, example questions & explanations for PSAT Math

All PSAT Math Resources

Example Questions

Example Question #434 : Algebra

Example Question #1 : How To Find The Solution To An Inequality With Addition

Example Question #141 : Algebra

Example Question #52 : Equations / Inequalities

Example Question #53 : Equations / Inequalities

Example Question #54 : Equations / Inequalities

Example Question #55 : Equations / Inequalities

Example Question #25 : Inequalities

Example Question #21 : Inequalities

Example Question #5 : How To Find The Solution To An Inequality With Multiplication

All PSAT Math Resources

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