What time zone?
2x + 5y = y + 7x
to isolate x:
Minus y from both sides
2x + 4y = 7x
Minus 2x from both sides
4y = 5x
divide equation by 5
\(x = {4y \over 5}\)
to isolate y:
divide equation by 4
\(x = {5x \over 4}\frac{}{}\)
add 1 to both sides
6f - 1 (+1) ≤ -7(+1)
6f ≤ -6
divide by six to both sides
\(\frac{6f}{6} = \frac{-6}{6}\)
simply
f = -1
a is the right one
a)10-t
10-(-x)= 10+x
where x>0
therefore, a) is the correct answer
216 x 360=77760
