ISEE Lower Level Math : Algebraic Concepts

Study concepts, example questions & explanations for ISEE Lower Level Math

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Example Questions

Example Question #1 : Equations

Determine the value of \dpi{100} x\(\displaystyle \dpi{100} x\)

 

\dpi{100} \small 3x+4=19\(\displaystyle \dpi{100} \small 3x+4=19\)

Possible Answers:

\dpi{100} 3\(\displaystyle \dpi{100} 3\)

\dpi{100} 4\(\displaystyle \dpi{100} 4\)

\dpi{100} 2\(\displaystyle \dpi{100} 2\)

\dpi{100} 5\(\displaystyle \dpi{100} 5\)

Correct answer:

\dpi{100} 5\(\displaystyle \dpi{100} 5\)

Explanation:

Find which answer makes the equation true.

\dpi{100} 3(5)+4=19\(\displaystyle \dpi{100} 3(5)+4=19\)

Example Question #2 : Equations

Simplify

\dpi{100} 2x+10-5+6x\(\displaystyle \dpi{100} 2x+10-5+6x\)

Possible Answers:

\dpi{100} 8x-5\(\displaystyle \dpi{100} 8x-5\)

\dpi{100} 8x+5\(\displaystyle \dpi{100} 8x+5\)

\dpi{100} 2x+11\(\displaystyle \dpi{100} 2x+11\)

\dpi{100} 2x-11\(\displaystyle \dpi{100} 2x-11\)

Correct answer:

\dpi{100} 8x+5\(\displaystyle \dpi{100} 8x+5\)

Explanation:

Combine the \dpi{100} 2x\(\displaystyle \dpi{100} 2x\) and the \dpi{100} 6x\(\displaystyle \dpi{100} 6x\) to get \dpi{100} 8x\(\displaystyle \dpi{100} 8x\)

\dpi{100} 10-5=5\(\displaystyle \dpi{100} 10-5=5\)

\dpi{100} 8x+5\(\displaystyle \dpi{100} 8x+5\)

Example Question #3 : Equations

Determine the value of \(\displaystyle x\)

\(\displaystyle -4x - 6 = 14\)

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 20\)

\(\displaystyle 6\)

\(\displaystyle -5\)

\(\displaystyle -4\)

Correct answer:

\(\displaystyle -5\)

Explanation:

\(\displaystyle -4(-5) - 6 = 14\)

Example Question #4 : Equations

Simplify

\(\displaystyle 4x - 5 + 3 - 7x\)

Possible Answers:

\(\displaystyle 11x -2\)

\(\displaystyle -3x-2\)

\(\displaystyle -3x+2\)

\(\displaystyle 11x +8\)

\(\displaystyle 3x + 2\)

Correct answer:

\(\displaystyle -3x-2\)

Explanation:

Combine like terms:

\(\displaystyle 4x - 7x = -3x\)

\(\displaystyle -5 + 3 = -2\)

So \(\displaystyle -3x -2\)

Example Question #4 : How To Find The Solution To An Equation

Solve for \(\displaystyle x\):

\(\displaystyle 3x+12=24\)

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 4\)

\(\displaystyle 7\)

\(\displaystyle 3\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 4\)

Explanation:

First subtract 12 from both sides

\(\displaystyle 3x+12-12=24-12\)

\(\displaystyle 3x=12\)

Now divide both sides by 3.

\(\displaystyle 3x/3=12/3\)

\(\displaystyle x=4\)

Example Question #5 : How To Find The Solution To An Equation

Solve for \(\displaystyle x\):
\(\displaystyle 4x-17=3\)

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle -3\)

\(\displaystyle 5\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 5\)

Explanation:

First add \(\displaystyle 17\) to both sides

\(\displaystyle 4x-17+17=3+17\)

\(\displaystyle 4x=20\)

Now divide both sides by \(\displaystyle 4\)

\(\displaystyle 4x/4=20/4\)

\(\displaystyle x=5\)

Example Question #5 : Equations

Determine the value of \(\displaystyle x\)

\(\displaystyle 5x + 7 = 17\)

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 2\)

Explanation:

\(\displaystyle 5(2) + 7 = 17\)

Example Question #6 : Equations

Solve for \(\displaystyle x\).

\(\displaystyle 6x-9=9\)

Possible Answers:

\(\displaystyle -9\)

\(\displaystyle 15\)

\(\displaystyle -3\)

\(\displaystyle 3\)

\(\displaystyle 18\)

Correct answer:

\(\displaystyle 3\)

Explanation:

Replace the variable \(\displaystyle x\) so the equation is correct.

\(\displaystyle 6(3)-9=9\)

Example Question #8 : How To Find The Solution To An Equation

Solve for \(\displaystyle x\).

\(\displaystyle 5(6+8x) = -10\)

Possible Answers:

\(\displaystyle 40\)

\(\displaystyle 2\)

\(\displaystyle 5\)

\(\displaystyle \frac{1}{2}\)

\(\displaystyle -1\)

Correct answer:

\(\displaystyle -1\)

Explanation:

Find the anwer for \(\displaystyle x\)which makes the equation true:

\(\displaystyle 5(6+8(-1))=-10\)

\(\displaystyle 30-40=-10\)

\(\displaystyle -10=-10\)

Example Question #9 : How To Find The Solution To An Equation

Evaluate the expression if \(\displaystyle x=7\).

\(\displaystyle 2x^{2}+4x-15\)

Possible Answers:

\(\displaystyle 44\)

\(\displaystyle 111\)

\(\displaystyle 41\)

\(\displaystyle 209\)

\(\displaystyle 112\)

Correct answer:

\(\displaystyle 111\)

Explanation:

\(\displaystyle 2x^{2}+4x-15\)

To solve, insert 7 for each \(\displaystyle x\).

When solving this part of the equation, remember the order of operations (PEMDAS) and square the number in the parentheses BEFORE multiplying by 2.

\(\displaystyle 2(7)^{2}+4(7)-15\)

\(\displaystyle 2(49)+28-15\)

\(\displaystyle 98+28-15=111\)

 

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