Algebra questions need help

Algebra
Tutor: None Selected Time limit: 1 Day

Jan 28th, 2015

Given the slope m = -0.6 and the point (19,17.6) from the graph
PLUG IN to y = mx + b to find b, the y-intercept

17.6 = -0.6(19) + b
17.6 = -11.4 + b
ADD 11.4 to both sides
29 = b

Therefore the EQUATION OF THE LINE is y = -0.6x + 29

The height at 25 hours (that is, x = 25):
PLUG IN x = 25 into above equation of the line
y = -0.6(25) + 29
y = -15 + 29
y = 14

Height of candle after 25 hours: 14 cm

Jan 28th, 2015

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Jan 28th, 2015
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Jan 28th, 2015
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