# PWN your inbox

# Recent Posts

#### Hi, Mike. How would you say the two math sections of the SAT are different (besides the obvious calculator use and the timing/number of questions)? I’m thinking in terms of content covered, types of questions, etc. Thanks!

April 9, 2021#### Hi! Love your book so far. I just started reviewing…

April 7, 2021Hi! Love your book so far. I just started reviewing. I looked at number 10 in the first section on page 29 and I was wondering how would you pick the correct answer if you chose to substitute 8 for d? Because both answer choices a and d work. Would you just try all the answer choices and choose different variable values and try again or is there a different way to approach it?

#### What am I not seeing?

April 5, 20214x + y = 7

2x – 7y = 1

If I multiply the second equation by 2, I can stack them and subtract:

4x + y = 7

4x – 14y = 2

So, 15y = 5, —> y = 3

Then: 2x – 7(3) = 1 –> 2x – 21 = 3 —> 2x = 24 –> x = 12

But: 4x + 3 = 7 –> 4x = 4 –> x = 1

What am I not seeing? The answer should be x= 5/3.

#### y -x =2 and y + x= -2 ,Then ( x+y)(x-y)=?

March 13, 2021y -x =2 and y + x= -2 ,Then ( x+y)(x-y)=?

#### Test 9 Section 4 Question 16

March 12, 2021Test 9 Section 4 Question 16

#### Test 9 Section 4 Question 15

March 12, 2021Test 9 Section 4 Question 15

#### Official Test 9 Section 4 #24

March 6, 2021Hi Mike… can you work through the steps to solve Q 24 from Official Test 9 Section 4? thanks!

#### In the given system of equations, a is a constant. If the system has no solutions, what is the value of a ?

February 18, 2021Hi Mike… can you solve this and explain please? Thanks!

ax + 5y = 8

12x + 15y = 10

In the given system of equations, a is a constant. If the system has no solutions, what is the value of a ?