if one point on a line is (5,-4) and the line's slope is -7, find the y-intercept.

Question

johnweldon1993 · Answer

$$\large y = mx+b$$

slope = m = -7
x = your x-value = 5
y = your y-value = -4
and you need to solve for 'b' (the y-intercept...

$$\large -4 = -7(5)+b$$

can you solve this?

anonymous · Answer

You go to the point (5,-4) and you go down 7 to the right 1 ( because the slope is negative 7) You should find where the line crosses the y axis and that's the y intercept. Hopefully that helps :)

anonymous · Answer

thanks @johnweldon1993 how do i salve the problem -4=-7(5)+b?

johnweldon1993 · Answer

Well we just solve  for 'b'

$$\large -4 = -7(5) + b$$

we know that -7 times 5 is -35 so

$$\large -4 = -35 + b$$

and finally we want to isolate 'b' right? so add 35 to both sides of the equation

$$\large b = ?$$