Question

79x20=(80x20)-(nx18)

Answer 1

79 × 20 = (80 × 20) - (n × 18) :First, multiply what is on the left of the equation

1580 = (80 × 20) - (n × 18) :Then, solve for what is in the first parenthesis

1580 = (1600) - (n × 18) :Then, act like there is a 1 in front of the negative and distribute

1580 = 1600 - 18n  :Then, subtract 1600 from both sides

-20 = -18n :Then, divide the whole equation by -18

1.1 = n

Your final answer is:

n = 1.1

Answer 2

`79*20=(80*20)-(n*18) \\\\ 1580=1600-18n \\\\ 1580-1600=18n \\\\ -20=18n \ |:2 \\\\ -10=9n \\\\ \boxed{n=-(10)/(9)}`