In the xy-plane, a line has slope 3 and x-intercept 6. What is the y-intercept of the line?  Answers
A) -18  B) -3  C) 0  D) 3  E) 9
Let the line be represented by a general equation y=mx+b, where m = slope (3) and b=y intercept. We are also given the value of x-intercept 6.   Theory : y intercept represents the point on the line where the x=0, and x intercept represents the point on the line where the y=0.   Putting these values in the equation : 0 = 3*6 + b =&gt; b = -18. Hence -18.
<result>A</result>
In the xy-plane, a line has slope 3 and x-intercept 6. What is the y-intercept of the line?