One t-shirt = $19
Number of t-shirts = $57 ÷ $19 = 3
Answer: 3 t-shirts
Firstly multiply 3x by 6 which gives you 18x
then multiply 6 and -7 which is -42. The final result is 18x-42.
If B=0, equation become Ax+C=0 or x=-C/A
since x is constant for the whole line, it is a vertical line, and the slope of L is ∞
1. 7m² + 6.5n - 4n + 2.5m² - n
7m² + 2.5m² + 6.5n - 4n - n
9.5m² + 2.5n - n
9.5m² + 1.5n = 1.7