2007-03-14 14:05:58 · 9 answers · asked by kikayrakista 1 in Education & Reference ➔ Homework Help
y = mx+ b
-1 = (1/2)4 + b
-1 = 2 + b
-3 = b
y = 1/2x -3
2007-03-14 14:10:42 · answer #1 · answered by BachAlive 2 · 0⤊ 1⤋
The equation of a line is y = mx + b where m is the slope and b is the y-intercept. You have the slope and an x and a y value. Plug them into the equation and you get -1 = 1/2(4) + b. Now solve for b. -1 = 2+ b. -3 = b. Now you have the y-intercept and the equation is y = 1/2x -3.
2007-03-14 21:11:58 · answer #2 · answered by dpirsq2 5 · 0⤊ 0⤋
y=mx + b
you know m (slope) = 1/2 so you have to find b.
substitute 4 for x and -1 for y...
-1 = 1/2 * 4 + b
-1 = 2 + b
-3 = b
substitute in b and your final equation is:
y = 1/2x - 3
I hope that's what you were asking for.
2007-03-14 21:10:36 · answer #3 · answered by Jenny 3 · 0⤊ 0⤋
y=mx+b (4, -1)
` x, y
-1=1/2(4)+b
-1=2+b
-1-2=b=2-2
-3=b
y=1/2x-3
2007-03-14 21:10:45 · answer #4 · answered by Miss_Sunshine 4 · 0⤊ 1⤋
the person above is close
-1=(1/2)(4) + b
-1=2+b
b= -3
y = 1/2x -3
2007-03-14 21:10:58 · answer #5 · answered by crzywriter 5 · 0⤊ 1⤋
y=1/2x-3
2007-03-14 21:10:28 · answer #6 · answered by m e r e d i th 4 · 0⤊ 1⤋
-1=(1/2)(4) + b
-1=2+b
b=1
y=1/2x + 1 <-------Answer
2007-03-14 21:09:30 · answer #7 · answered by pencil_steeler364 1 · 0⤊ 1⤋
easy
use formula
y - ysub1 = m (x-xsub1)
plug the 4 and the -1 into this formula, (where it says xsub 1 and ysub1)
2007-03-14 21:10:30 · answer #8 · answered by SUPERMAN 4 · 0⤊ 1⤋
y-y1=m(x-x1)
y-(-1)=1/2(x-4)
y+1=1/2(x-4)
2y+2=x-4
2y=x-6
y=(x-6)/2
2007-03-14 21:10:33 · answer #9 · answered by Mark 2 · 0⤊ 1⤋