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# In the xy-coordinate plane, lines j and k intersect at point (1, 3). I

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Math Expert
Joined: 02 Sep 2009
Posts: 58427
In the xy-coordinate plane, lines j and k intersect at point (1, 3). I  [#permalink]

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19 Dec 2018, 01:25
00:00

Difficulty:

25% (medium)

Question Stats:

75% (01:24) correct 25% (01:58) wrong based on 48 sessions

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In the xy-coordinate plane, lines j and k intersect at point (1, 3). If the equation of line j is y = ax + 10, and the equation of k is y = bx + a, where a and b are constants, what is the value of b?

A. -10
B. -1/10
C. 1
D. 1/10
E. 10

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Re: In the xy-coordinate plane, lines j and k intersect at point (1, 3). I  [#permalink]

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19 Dec 2018, 01:34
1
Line j: y=ax+10
By substitution of (1,3)
a=-7
Similarly for line k: 3=a+b => b=10

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Re: In the xy-coordinate plane, lines j and k intersect at point (1, 3). I   [#permalink] 19 Dec 2018, 01:34
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