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SSAT Middle Level Math : How to find a line on a coordinate plane

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例子问题tions

例子问题tion #1 :Geometry

Give the slope of the line that passes through (4,2) and (-8,-3) .

Possible Answers:

$-\frac{5}{2}$

$\frac{12}{5}$

$-\frac{2}{5}$

$\frac{5}{12}$

$\frac{1}{4}$

Correct answer:

$\frac{5}{12}$

解释:

Use the slope formula, substituting $x_{1}= 4, y_{1}=2,x_{2}= -8, y_{2}=-3$ :

$m =\frac{ y_{2}- y_{1} }{x_{2} - x_{1}}=\frac{ -3-2 }{-8-4} = \frac{ -5 }{-12} = \frac{5 }{12}$

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例子问题tion #1 :Geometry

Give the slope of a line that passes through (5,5) and (2,4) .

Possible Answers:

$\frac{2}{5}$

$\frac{1}{2}$

$\frac{4}{5}$

$\frac{1}{3}$

$\frac{3}{4}$

Correct answer:

$\frac{1}{3}$

解释:

Using the slope formula, substituting $x_{1}=5$ , $x_{2}=2$ , $y_{1}=5$ , and $y_{2}=4$ :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{4-5}{2-5}$

Subtract to get:

$m=\frac{-1}{-3}$

Cancel out the negative signs to get:

$m=\frac{1}{3}$

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例子问题tion #1 :Coordinate Geometry

Give the slope of a line that passes through (-7,4) and (2,5) .

Possible Answers:

$\frac{1}{9}$

$\frac{5}{7}$

$\frac{4}{7}$

$\frac{3}{8}$

$\frac{2}{9}$

Correct answer:

$\frac{1}{9}$

解释:

Using the slope formula with $x_{1}=-7$ , $x_{2}=2$ , $y_{1}=4$ , $y_{2}=5$ :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{5-4}{2-(-7)}$

Subtract to get:

$m=\frac{1}{9}$

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例子问题tion #4 :Geometry

Give the slope of the line that passes through (-5,3) and (1,9) .

Possible Answers:

$-\frac{3}{4}$

$-\frac{1}{2}$

$\frac{1}{2}$

$\frac{3}{2}$

Correct answer:

解释:

Using the slope formula for

$x_{1}=-5$ , $x_{2}=1$ , $y_{1}=3$ , and $y_{2}=9$ :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{9-3}{1-(-5)}$

Combine the negative signs to get:

$m=\frac{9-3}{1+5}$

Subtract and add to get:

$m=\frac{6}{6}$

Reduce to get:

m=1

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例子问题tion #2 :How To Find A Line On A Coordinate Plane

Give the slope of a line that passes through (4,7) and (2,3) .

Possible Answers:

$-\frac{1}{2}$

$\frac{3}{7}$

$\frac{1}{2}$

Correct answer:

解释:

Using the slope formula, whereis the slope, $(x_{1},y_{1})=$ (4,7) , and $(x_{2},y_{2})=$ (2,3) :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{3-7}{2-4}$

$m=\frac{-4}{-2}$

m=2

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例子问题tion #6 :Geometry

Find the slope of the line that passes through the points (5,-4) and (-5,-4)

Possible Answers:

$\frac{4}{5}$

Cannot be determined

Correct answer:

解释:

Using the slope formula, whereis the slope, $(x_{1},y_{1})=$ (5,-4) , and $(x_{2},y_{2})=$ (-5,-4) :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{-4-(-4)}{-5-5}$

$m=\frac{-4+4}{-10}$

$m=\frac{0}{-10}$

m=0

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例子问题tion #7 :Geometry

Find the slope of a line with points (-1,0) and (-10, 5) .

Possible Answers:

$\frac{5}9 {}$

$-\frac{9}{5}$

Cannot be determined

$\frac{9}{5}$

$-\frac{5}{9}$

Correct answer:

$-\frac{5}{9}$

解释:

Using the slope formula, whereis the slope, $(x_{1},y_{1})=$ (-1,0) , and $(x_{2},y_{2})=$ (-10, 5) :

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$m=\frac{5-0}{-10-(-1)}$

$m=\frac{5}{-10+1}$

$m=-\frac{5}{9}$

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例子问题tion #21 :Graphing

Billy set up a ramp for his toy cars. He did this by taking a wooden plank and putting one end on top of a brick that was 3 inches high. He then put the other end on top of a box that was 9 inches high. The bricks were 18 inches apart. What is the slope of the plank?

Possible Answers:

$\frac{5}{9}$

$\frac{1}{18}$

$\frac{3}{18}$

$\frac{1}{3}$

Correct answer:

$\frac{1}{3}$

解释:

The value of the slope (m) is rise over run, and can be calculated with the formula below:

$m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

The coordinates of the first end of the plank would be (0,3), given that this is the starting point of the plank (so x would be 0), and y would be 3 since the brick is 3 inches tall.

The coordinates of the second end of the plank would be (18,9) since the plank is 18 inches long (so x would be 18) and y would be 9 since the box was 9 inches tall at the other end.

From this information we know that we can assign the following coordinates for the equation:

$\left(x_{1},y_{1}\right) = (0,3)$ and $(x_{2}, y_{2})= (18,9)$

Below is the solution we would get from plugging this information into the equation for slope:

$m = \frac{9-3}{18-0}}$

This reduces to $\frac{6}{18} =\frac{1}{3}$

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SSAT Middle Level Math : How to find a line on a coordinate plane

Study concepts, example questions & explanations for SSAT Middle Level Math

All SSAT Middle Level Math Resources

例子问题tions

例子问题tion #1 :Geometry

例子问题tion #1 :Geometry

例子问题tion #1 :Coordinate Geometry

例子问题tion #4 :Geometry

例子问题tion #2 :How To Find A Line On A Coordinate Plane

例子问题tion #6 :Geometry

例子问题tion #7 :Geometry

例子问题tion #21 :Graphing

All SSAT Middle Level Math Resources

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