Page 124 - Math Course 3 (Book 1)

Linear Equations: Rate of Change

Find Coordinates Given Slope Zero Slope

Example Find the slope of the line that passes through
(–3, –1) and (5, –1).

A. undefined
Find the value of r so that the line through (6, 3) and B. 8
(r, 2) has a slope of 1 C. 2
2
y – y D. 0
2
m = x – x 1 1 Slope formula
2
1 2 – 3
2 = r – 6 Substitute. Answer

1 = –1
2 r – 6 Subtract. Undefined Slope
1 = –1
2 r – 6 Find the slope of the line that passes through
2(–1) = 1(r – 6) Find the cross products. (5, –1) and (5, –3).
A. undefined
–2 = r – 6 Simplify. B. 0
C. 4
–2 + 6 = r – 6 + 6 Add 6 to each side. D. 2

Answer 4 = r

Answer
Your Turn! Find Coordinates Given Slope

Positive Slope Find the value of p so that the line through (p, 4)
and (3, –1) has a slope of – 5
Find the slope of the line that passes through (4, 5) 8
and (7, 6). A. 5

A. 3 B. – 5
1 8
B. –
3 C. –5
C. 1 D. 11
3
D. –3 Answer
Answer

Negative Slope
Find the slope of the line that passes through
(–3, –5) and (–2, –7).

A. 2

B. –2

C. – 1
2
1
D. 2
Answer

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