JAMB - Mathematics (2018 - No. 29)
Find the equation of the line through (5,7) parallel to the line 7x + 5y = 12
5x + 7y = 20
7x + 5y = 70
xy = 7
15x + 17y = 90
Explanation
Find the equation of the line through (5,7) parallel to the line 7x + 5y = 12
m\(_1\) = m\(_2\) condition for parallelism
From 7x + 5y = 12
5y = -7x + 12
y = \(\frac{-7x}{5}\) + \(\frac{12}{5}\)
m\(_1\) = \(\frac{-7}{5}\) = m\(_2\)
equation of the line = y - y\(_1\) = m\(_2\)[x - x\(_1\)]
y - 7 = \(\frac{-7}{5}\)[x - 5]
5(y - 7) = -7(x - 5)
5y - 35 = -7x + 35
5y + 7x = 35 + 35
5y + 7x = 70
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