According to your answer, it looks like you could use some help finding the slope of a line. We recommend starting with Volume 3 of the Learn Math Fast System. That book will teach you all about slopes, the y-intercept, and creating linear equations. This is the turning point in math where it goes from basic math to higher math.
RESULTS: The end of 7th Grade Level, however, the Learn Math Fast System is for all ages. Volume 3 covers 6th - 7th grade topics, but there is no mention of grade level within the books.