The Purplemath Forums

Hi, Can someone please explain to me how to do this problem step-by-step Solve for b: H=5/3(a+2ab) I know the answer is b=3H-5a/10 However, I'm just unsure how to get there, more specifically how H became 3H. More, more specifically I don't know how to multiply the fraction with the equation... for ...

Can someone please explain to me how to do this problem step-by-step Solve for b: H=5/3(a+2ab) ....But, how did 3 get multiplied with H.. shouldn't it be 5/3*H = 5/3 * H/3? (why is H getting multiplied with the denominator??) You need to get "b" by itself. It is currently in the denominat...

Can someone please help me solve this system of equation by elimination and/or substitution. I'm specifically looking for a demonstration of this format of a system being solved by elimination and/or substitution . I only get how to do systems that are in the form of y=x+a y=x-b and etc. i.e. where ...

I only get how to do systems that are in the form of y=x+a y=x-b and etc. i.e. where the variables are on the same side of both the equations. Ah. So you need to learn how to solve, for instance, the second equation you posted for "y=". To learn how to do this, try this lesson . Note: To ...

Hi, I am having trouble solving this problem. I have made at least 4-5 attempts on it by now. Can someone please help me out? Here is the problem: A number consists of two digits. 13 more than 7 times the units digits is 3 times the tens digit. If the digits are reversed, 2 times the new number is 3...

Hi, I am completely not getting how to solve this problem involving systems of inequalities. Here is the question: What is the maximum value of 2x+3y+4, subject to the constraints listed below? x > 0 y < 0 x > 5 y > -4 I know the answer to the question. And I know that in order to solve this questio...

For instance, I don't understand how y < is the same as (5,0). It isn't. Instead, try graphing the system of inequalities and finding the coordinates of the corner points. (Note: I suspect that your third inequality is actually "x < 5".) Then plug those corner points into the optimization...

HI, I am having trouble getting the correct answer for this problem: 4x^2+8y-4xy-8x I have made several attempts. Here is one of them: 4x^2+8y-4xy-8x 1) Grouped like terms together: = (4x^2 + (-8x))+(8y + (-4xy)) 2) Factored each term: (2*2*x*x + (-1)*2*2*2*x) + (2*2*2*y + (-1)*2*2*x*y) 3) Found gre...

stapel_eliz wrote:

onmyown wrote:4) Used distributive property:
4x(x-2) + 4y(2-x)
5) Therefore, the solution to the problem is the binomial:
(4x+4y)(x-2)

How did the "2 - x" turn into "x - 2"? Is 5 - 3 the same value as 3 - 5?

I got the right answer now. Thanks

Hi, can someone please help me help convert this equation into a quadratic equation (i.e. of the form y=ax^2+bx+c) 5(x/7-9)^2=7y+3 How would I go about simplifying the left side, I don't really know how to deal with x/7-9. How do I subtract x/7 and 9. I forgot how to do this :( Just quickly tell me ...