SOLUTION: What is the y-intercept of 3x-y=7? Please help me with this problem! Thanks.

Question 109362This question is from textbook algebra2 with trigonometry
: What is the y-intercept of 3x-y=7? Please help me with this problem! Thanks. This question is from textbook algebra2 with trigonometry

Answer by bucky(2189) (Show Source): You can put this solution on YOUR website!
The y-intercept is the value of y when x is equal to zero. (Think of it as any point that
is on the y-axis has an x-value of zero).
.
The equation you were given is:
.
3x - y = 7
.
Set x equal to zero and this equation becomes:
.
3*0 - y = 7
.
The 3*0 is equal to zero and can, therefore, be dropped from the equation to leave just:
.
-y = 7
.
You are trying to solve for +y so all you need to do in this case is multiply both sides
of the equation by -1 to get:
.
y = -7
.
That's the answer ... the y-intercept is the point (0, -7) and the graph of the given equation
you started with crosses the y-axis at -7
.
Hope this helps you to understand the problem a little better.
.
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