anonymous
  • anonymous
Select the equation of the line that passes through the point (5, 7) and is perpendicular to the line x = 4.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
y = 4 x = 5 y = 7 x = 7
AakashSudhakar
  • AakashSudhakar
So this is actually much easier than it looks. A powerful assumption can be made right from the get-go. Notice that the problem states that the line is perpendicular to the line x=4. Recall that perpendicular lines form 90 degree angles with each other and have opposite slopes. The line x=4 is actually not a function, since on the line, there are infinite values of y that satisfy the point x=4. This makes its slope actually indeterminate. However, simply visualize what a line would look like if it formed a 90 degree angle with the line x=4. You should realize that the line formed is perfectly horizontal (since a horizontal line is the only kind of line that can form a right angle with a vertical line) and thus has some equation y = ?. Now, to find what that value is. The problem also states that the line passes through the point (5,7). Visualize yet again the graph of y = ?. Yes, I know that there's no value for y, but any graph of y = (number) means that there's a horizontal line passing through the point (0, (number)). This means that for any line y = ?, x varies infinitely but y stays constant, at some value. But if the line passes through (5, 7), then you know that the value of y that the line passes through is 7. That should give you the value that the y-line is constantly equal to.
anonymous
  • anonymous
thank you helped alot

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anonymous
  • anonymous
Select the coordinates of two points on the line y = −2. (2, −2) and (−2, 2) (−2, −2) and (−2, 0) (2, −2) and (0, −2) (−2, 2) and (−2, −2)
anonymous
  • anonymous
can you help me wwith this one also @AakashSudhakar
AakashSudhakar
  • AakashSudhakar
For this one, keep in mind what you learned in the last problem. Since y = -2, Then regardless of what value x takes on, y is ALWAYS equal to -2. So you can already eliminate three of the choices and see which answer is correct. For any line y=?, y does not change with respect to x. x can be whatever it wants and y will always stay the same. For example, if I had the line y=6, y will always be equal to 6 for any value of x. If x = 6, y = 6. If x = 1, y = 6. If x = -252491, y is still equal to 6.
anonymous
  • anonymous
ok thank you

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