Question

I know the top point on the graph is (0,7), but I don't know how they got the 2nd point.

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Answer 1

what other point ?

Answer 2

What they did was solve the two intercepts. One for when x = 0 and the other for when y = 0.

Answer 3

So, set y = 0, and solve for x.

0 = 3x+7
x = -7/3 = -3 and 1/3

The second intercept is (-3 1/3, 0)

Answer 4

How would I plot that please. Thank you

Answer 5

The plot is given in the picture you linked. (-3.333, 0) is the x intercept point.

Answer 6

if you want to plot
y= 3x+7
I would find 2 points. for example if x=0 we get y= 3*0+7= (0,7)
if we use x=-1
y = 3*-1 + 7 = -3+7 = 4 so (-1,4) is another point
plot them, then draw a line through them, and continue as far as you like in both directions

Answer 7

as a check, the line should also go through the point (-2, 1)

Answer 8

does that help ?

Answer 9

Yes, thank you everybody :)