Question

Which of the following best describes the technique used to graph the equation, y = -2x + 8, using slope and y-intercept?


Mark a point at 8 on the y-axis, move upward 2 and right 1, mark the point and draw the line.

Mark a point at 8 on the y-axis, move downward 2 and right 1, mark the point and draw the line.

Mark a point at -2 on the y-axis, move downward 8 and right 1, mark the point and draw the line.

Mark a point at -2 on the y-axis, move upward 8 and right 1, mark the point and draw the line.

Answer 1

True or False? Y varies directly with x and y = -9 when x = 3. When y = 27, the value of x is 9.

Answer 2

when x=3 then y is:
y=-2*3+8=+2

Answer 3

I used your equation y=-2x+8

Answer 4

y = -2x + 8

8 is your intercept, and it has a negative slope of 2. Which above describes that?

Answer 5

WOW

Answer 6

so its true for the second question?

Answer 7

Using the original function: y = -2x + 8

"Y varies directly with x and y = -9 when x = 3. When y = 27, the value of x is 9."

Plug them in and you tell me. I'll plug the first pair in.

-9=-2(3)+8

6+8=14, that's false.

Try the 2nd one.

Answer 8

-9=-2(3)+8 is false

Answer 9

Yes ^