I do not understand question #4 pg 156 advanced systems of equations?

# In question #10 of the backsolving chapter…

In question #10 of the backsolving chapter : in the xy plane, a line containing the points (a, a^3) and (10,40) passes through the origin. Which of the following could be the value of a?

I found the explanation in the answer key to be too time-consuming if I were to solve the equation with backsolving. Can you explain how to solve this question algebraically instead?

# Hi Mike, can you explain how to solve SAT 8, Section 3, #6 as a “system of equations?” Thanks.

Hi Mike, can you explain how to solve SAT 8, Section 3, #6 as a “system of equations?” Thanks.

# A question on polynomials practice question #10 (p. 149 in PWN the SAT Math Guide)…

A question on polynomials practice question #10 (p. 149 in PWN the SAT Math Guide): I understand how to solve using polynomial long division but can you explain your shortcut from the answer explanation? How would we know to plug in -3?

# On page148, what does it mean when question 3 states,”[i]f r(x) is divisible by x?” Is this mentioned else where in the book?

On page148, what does it mean when question 3 states,”[i]f r(x) is divisible by x?” Is this mentioned else where in the book?

# How do you know the shaded circle are 3/4 of the entire circle on page 271 question 4

How do you know the shaded circle are 3/4 of the entire circle on page 271 question 4

# How does the arc length equal the radian measure of angle AOB ? (question 2 on page 271)

How does the arc length equal the radian measure of angle AOB ? (question 2 on page 271)

# For question 5 on page 242(Angles, Triangle and Polygons)…

For question 5 on page 242(Angles, Triangle and Polygons), could you explain why the triangle was put into 60,30,90 right triangle and how you came up with b/2 *square root of 3 as the height?

# if y is inversely proportional to x and y = 41 when x = 10, what is the value of y when x =7?

if y is inversely proportional to x and y = 41 when x = 10, what is the value of y when x =7?

# Could you further explain your explanation of Practice Question #4 in PWN the SAT Math Guide “Polynomials” chapter (p. 148).

Could you further explain your explanation of Practice Question #4 in PWN the SAT Math Guide “Polynomials” chapter (p. 148). In your long division confirmation of the answer (explanation p. 326), how do you know to divide by 9x + 1?

# if f(2x+3)=4x-7 for all values of x, for what value of t is f(t)=1

if f(2x+3)=4x-7 for all values of x, for what value of t is f(t)=1

# For #2 on the functions chapter, could you have just added 1 to each side to get f(x) by itself?

For #2 on the functions chapter, could you have just added 1 to each side to get f(x) by itself?

f(x-1)= x+1–>f(x)=x+2

I’m having trouble wrapping my head around your previous explanations and wanted to confirm that this method works.

# Hi, I don’t get these types of problems…

Hi, I don’t get these types of problems & would really like an explanation for their solution. (x- 3)(x – d) = x^2 – 2dx + m. I don’t know how to find the value of dm because I can’t isolate d without getting a fraction. Please help );

# Is it possible to solve question 3 of Solving systems of linear equations using the solving for expressions method?

Is it possible to solve question 3 of Solving systems of linear equations using the solving for expressions method? If so, how do you do it?

# When talking about solution sets…

When talking about solution sets, do they consist of both the x and y coordinates or whatever satisfies the question? For example, in the problem x+1=√(x+3), would the solution set be {1} or {(1,2)}, or does it really not matter? Thank you.