x - 7y = 2 and x2 = 34y2 + 7xy - 16
Take the linear equation (x - 7y = 2) and solve it for either x or y.
It seems easier to solve it for x: x = 7y + 2
Replace this into the other equation:
x2 = 34y2 + 7xy - 16 ---> (7y + 2)2 = 34y2 + 7(7y + 2)y - 16
Simplify: ---> 49y2 + 28y + 4 = 34y2 + 49y2 + 14y - 16
Simplify: ---> 0 = 34y2 - 14y - 20
Divide both sides by 2: 0 = 17y2 - 7y - 10
Factor: 0 = (17y + 10)(y - 1)
Solve: y = -10/17 or y = 1
Substituting these values back into the equation: x - 7y = 2
x - 7(-10/17) = 2 ---> x = -36/17 ---> Answer: (-36/17, -10/17)
x - 7(1) = 2 ---> x = 9 ---> Answer: (9, 1)
I believe that when graphed x2 = 34y2 + 7xy - 16 is a hyperbola and x - 7y = 2 is a straight line, so that their solution, their intersection, will either by no points, one point, or two points; in this case: two points.
Perhaps someone can post the graph ...
x - 7y = 2 and x2 = 34y2 + 7xy - 16
Take the linear equation (x - 7y = 2) and solve it for either x or y.
It seems easier to solve it for x: x = 7y + 2
Replace this into the other equation:
x2 = 34y2 + 7xy - 16 ---> (7y + 2)2 = 34y2 + 7(7y + 2)y - 16
Simplify: ---> 49y2 + 28y + 4 = 34y2 + 49y2 + 14y - 16
Simplify: ---> 0 = 34y2 - 14y - 20
Divide both sides by 2: 0 = 17y2 - 7y - 10
Factor: 0 = (17y + 10)(y - 1)
Solve: y = -10/17 or y = 1
Substituting these values back into the equation: x - 7y = 2
x - 7(-10/17) = 2 ---> x = -36/17 ---> Answer: (-36/17, -10/17)
x - 7(1) = 2 ---> x = 9 ---> Answer: (9, 1)
I believe that when graphed x2 = 34y2 + 7xy - 16 is a hyperbola and x - 7y = 2 is a straight line, so that their solution, their intersection, will either by no points, one point, or two points; in this case: two points.
Perhaps someone can post the graph ...