Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On

 Tutoring Home For Students Tools for Tutors Our Tutors Register Recently Solved
 By Tutor
| By Problem Number |

Tutor:

# Recent problems solved by 'mathgranny'

 Graphs/618572: Find the intercepts of -x-y=2 and graph the line.1 solutions Answer 389388 by mathgranny(7)   on 2012-06-08 20:49:49 (Show Source): You can put this solution on YOUR website!Find the intercepts of -x-y=2 and graph the line. The x-intercept is on the x-axis, the point where the line crosses the x-axis. Plot a few points on the x-axis and list the coordinates of the points. Which coordinate is always 0? For points on the x-axis, the second coordinate is 0, so Y = 0. In the above equation set y = 0, and solve for x. -x - y = 2. -x - 0 = 2 -X = 2 S0 +X = -2 (-2, 0) Is the x-intercept which is on the line. TO FIND THE Y - INTERCEPT, SET X = 0 -(0) - Y = 2 -Y = 2 SO +Y = -2 AND THE POINT (0, -2) is on the line. Plot these two points and draw a line through them. You can also find the slope by calculating the rise over the run. Remember that each point that is the intercept has 0 for one coordinate. students sometimes get this backwards. Just remember y-intercept? x = 0 x-intercept ? y = 0
 Graphs/619116: Solve the system of equations: 6x-4y=-16 and 4y-6x=16 and is the system consistent or inconsistent and are the equations dependent or independent. 1 solutions Answer 389375 by mathgranny(7)   on 2012-06-08 20:12:01 (Show Source): You can put this solution on YOUR website! the system of equations consists of 2 equivalent equations. you can tell this if you multiply both sides of either equation by -1.
 Trigonometry-basics/619102: how would find a negative co-terminal angle of 15pi/4 pi/4 would take you one fourth around the circle to the left. It takes 2 pi to get around the circle once going clockwise. 15/4 = 3+ 3/4 pi which would be 2 pi + 1 + 3/4 pi. 2 pi equals one complete circle and another 3/4 , so you would end up with your terminal side in Quadrant I and co terminal angle would be 45 degrees1 solutions Answer 389361 by mathgranny(7)   on 2012-06-08 18:51:37 (Show Source):
 t e s t/619084: What do you know about negative exponents? Do you remember that: 2^(-3) = 1/2^3 so a^(-3) = 1/a^3 =( 4)/a^3 ÷8/a^6 = 4/a^3 (a^6/8) = 1/2 a^3 1 solutions Answer 389351 by mathgranny(7)   on 2012-06-08 18:21:23 (Show Source): You can put this solution on YOUR website! What do you know about negative exponents? Do you remember that: 2^(-3) = 1/2^3 so a^(-3) = 1/a^3 4a^(-3) ÷ 8a^(-6) =( 4)/a^3 ÷8/a^6 = 4/a^3 (a^6/8) = 1/2 a^3
 Money_Word_Problems/619072: Judy bought a coat at a 20% discount sale for \$72. What was the origional price of the coat?1 solutions Answer 389342 by mathgranny(7)   on 2012-06-08 17:39:46 (Show Source): You can put this solution on YOUR website!Judy bought a coat at a 20% discount sale for \$72. What was the original price of the coat? Imagine yourself buying a coat. The items mentioned are 20% discount sale , original price . Since we don't use o for a variable (looks like 0) let's use r for regular price(or original Price) When something is on sale we subtract something from he regular price to get the sale price. Fill in the blank: regular price - ______ = sale price. Regular price - actual discount amt. = sale price r - d = s We need to find regular price. That means we are either given the sale price and the discount amt. or we have the info to find them. There are 2 numbers in the problem. What does \$72 represent. We are told sale price = \$72. Now how do we use 20% to find discount amt. Discount amt is the small amt taken away from the reg price to get sale price. d = 20% of r so d = .20r reg. price - discount = sale price r - d = s r - .20r = 72 1r - .20r = 72 .80r = 72 I see multiplication , so I divide r = 72/.80 = \$90 Ask yourself if this answer is reasonable. Is a 20% discount large or small. I'd say small. If reg price is \$90 and sale price is \$72 is this a small decrease or a large one. I'd say small.
 Signed-numbers/619076: Help with this problem: N% of 18 is 63. To the nearest tenths, N = and The sum of two consecutive odd numbers plus the next even number is 926. Write an algebraic equation that can be used to solve this problem. 1 solutions Answer 389332 by mathgranny(7)   on 2012-06-08 17:06:59 (Show Source): You can put this solution on YOUR website!The sum of two consecutive odd numbers plus the next even number is 926. Write an algebraic equation that can be used to solve this problem. We have 3 unknown numbers. odd number one odd number two and the next even number. let first odd number be represented by x The second odd number is x + 2 and the next even number is x + 3 x + x + 2 + x + 3 = 926 * (first odd ) ( next odd) + ( next even) = 926 combining lime terms we get 3x + 5 = 926 - 5 = -5 __________________ 3x = 921 x = 307 Then x + 2 is next odd number = 309 and the next even number is = 310 307 + 309 + 310 = 926 * Since odd numbers are all separated by 2 ( for ex 5,7,9,11) Then if x is first odd number, we have to add 2 to get the NEXT(consecutive) odd number.