SOLUTION: I am having trouble with a set of questions on my daughters paper I'm helping her with. Could you please help me and explain it so I can teach it to her on how to solve it. Thank y

Question 1005462: I am having trouble with a set of questions on my daughters paper I'm helping her with. Could you please help me and explain it so I can teach it to her on how to solve it. Thank you. It says the two lines y=6x+15 and y=mx-4 intersect at x=-2. What is the y coordinate of their intersection point.....and what is the value of m. Please help me thank you for your time.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the two lines y=6x+15 and y=mx-4 intersect at x=-2. What is the y coordinate of their intersection point.....and what is the value of m?
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Wherever the equations intersect their y values are the same,
and their x values are the same.
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Since the y values are the same,
Solve:: 6x+15 = mx-4
Since x = -2 when the lines intersect, 6*-2+15 = m(-2)-4
-2m -4 = -12+15
-2m = 3+4
m = -7/2
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Find the y coordinate of the intersection point::
Since y = 6x+15
Solve:: y = 6(-2)+15 = -12+15 = 3
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Cheers,
Stan H.
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For the equation y
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