Post your question in the Comment section below, and a GRE expert will answer it as fast as humanly possible.
- Video Course
- Video Course Overview
- General GRE Info and Strategies - 7 videos (free)
- Quantitative Comparison - 7 videos (free)
- Arithmetic - 42 videos
- Powers and Roots - 43 videos
- Algebra and Equation Solving - 78 videos
- Word Problems - 54 videos
- Geometry - 48 videos
- Integer Properties - 34 videos
- Statistics - 28 videos
- Counting - 27 videos
- Probability - 25 videos
- Data Interpretation - 24 videos
- Analytical Writing - 9 videos (free)
- Sentence Equivalence - 39 videos (free)
- Text Completion - 51 videos
- Reading Comprehension - 16 videos
- Study Guide
- Philosophy
- Office Hours
- Extras
- Prices
Comment on Use Intercept to Find Slope
Hi Brent,
When looking at this, my mind went:
1) y intercept = -2 and we're given that c = 3a/2
2) in y intercept form the component of x = slope (in this case component of x = a) and c is the y intercept
3) therefore 3a/2=-2 so solve for a=-4/3
Is this logic sound?
Yes, that does yield the
Yes, that does yield the correct answer, but it should be noted that the y-intercept of the line is NOT equal to c (as you suggest). The y-intercept = c/b
Hi Brent,
Is the below approach correct?
Since y intercept is -2, we can conclude that y = -2 & x = 0.
Therefore substituting the above value in the equation along with c = 3a/2 we get
y = (a/b).x + (c/b)
-2 = (a/b).0 + 3a/2b
-2 = 3a/2b
a/b = -4/3
Therefore slope = a/b = -4/3
Perfect approach!!!
Perfect approach!!!
I solved it like this; since
Your solution is similar,
Your solution is similar, except I first show that c is the y-intercept and a/b = slope (not "a" as you suggest).
Nevertheless, good work!
Cheers,
Brent