2007-11-27 00:33:51 · 8 answers · asked by Patricia S 1 in Science & Mathematics ➔ Mathematics
Set x = 0 and solve it for y.
2007-11-27 00:40:59 · answer #1 · answered by Kimon 7 · 1⤊ 1⤋
The y-intercept is the point on the y-axis where the
line cuts it. At this point, the co-ordinate (x,y) has a
value of 0 for x.
So, if you set x=0 in the given linear equation, you
will find the y term.
For 3x+7y=21, when x=0,
3(0)+7y=21
7y=21, and y=3
The line cuts the y-axis 3 units above the origin,
and its co-ordinate is (0,3)
2007-11-27 08:49:37 · answer #2 · answered by Grampedo 7 · 0⤊ 0⤋
3x+7y=21
Let x = - 1
3(-1)+7y=21
-3 + 7y = 21
7y = 24
y = 24/7
Let x = - 2
3(-2)+7y=21
-6 + 7y = 21
7y = 27
y = 27/7
Let x = 0
3(0)+7y=21
7y = 21
y = 3
Let x = 1
3(1)+7y=21
3 + 7y = 21
7y = 18
y = 18/7
So y-intecept is 3
2007-11-27 10:22:10 · answer #3 · answered by Chan A 3 · 0⤊ 2⤋
At Y-intercept the value of X is equal to 0.
Just plug X=0 into your equation and solve for Y.
2007-11-27 08:41:36 · answer #4 · answered by ArArAt 3 · 1⤊ 1⤋
3x+7y=21
just solve for y
7y = - 3x + 21
y = - 3/7 x + 3
y -intercept = 3
2007-11-27 08:46:43 · answer #5 · answered by CPUcate 6 · 1⤊ 1⤋
y-intercept is the distance where line cuts the y-axis from the origin. Everyone knows at y-axis x=0. put x=0 in given equation and you will get y-intercept equal to 3. Good luck for further problems in maths. I have added you to my contact list for maths i am always there.
2007-11-27 08:50:51 · answer #6 · answered by mat619 2 · 0⤊ 1⤋
y=mx+c
y=(21-3x)7
2007-11-27 08:42:42 · answer #7 · answered by Raga s 3 · 1⤊ 0⤋
y intercept occurs when x = 0
7y = 21
y = 3 is y- intercept.
2007-11-27 10:53:43 · answer #8 · answered by Como 7 · 3⤊ 1⤋