Question

Find the x- and y- intercepts of the graph of y=\sqrt{7 x + 9}. If some solution does not exist, type N for both coordinates.

Answer 1

Well, the y-intercept has an x-coordinate of 0. So what do you get for y when x=0?

Answer 2

wouldnt y be also 0?

Answer 3

\[y=\sqrt{7(0)+9} = ?\]

Answer 4

3

Answer 5

Correct. That's the y-intercept. Now, the x-intercept has a y-coordinate of 0. So set y=0 and solve for x,\[0=\sqrt{7x+9}\]

Answer 6

-9/7

Answer 7

Well done. That's the x-intercept.

Answer 8

thanks!

Answer 9

You're welcome