Question

find the value of x if a line having a slope of 4 and passing through point (3,8) intersects the x-axis.

Answer 1

@Xeph

Answer 2

what's the equation of the line?

Answer 3

I'm going to bed now but I'll give you a few tips that should get you through this problem

Answer 4

y-y1=m(x-x1)

Answer 5

First, find the equation of your line by using point-slope form (which you just started using :D)

Answer 6

can i use this formula y-y1=m(x-x1)

Answer 7

That is point-slope form of a line. you use that to find your line's equation in this type of problem

Answer 8

since the question gives you a point, and it gives you a slope

Answer 9

After you have your line's equation, consider when the line crosses the x-axis (you're looking for x at that point)

Answer 10

can i use this formula y-y1=m(x-x1)

Answer 11

yes or no

Answer 12

here's a hint: think about what y is equal to, at the point where the line crosses the x axis. then solve for x

Answer 13

x=1

Answer 14

I already answered that question. That is the point-slope equation of a line. If you want the equation for YOUR line, then substitute into that formula to obtain it

Answer 15

when you have your line's equation, you can solve for x or y at various points on your line

Answer 16

ok thank you :)

Answer 17

so i got thr answer x=1

Answer 18

you're welcome! good night, good luck on the rest of your math :)

Answer 19

thats the answer?

Answer 20

@Xeph