Monifer used substitution to solve this system of equations. Which equation could be the result of her
first step?
3a + b = 225
b = a - 15

options:
3a + a = 225
3a + a - 15 = 225
b= 3a + b
3a + b = a - 15

Mustafa heloise and gia have written more than a combined total of 22 articles for the school newspaper.heloise has written 1/4 has written articles as mustafá has gia has written 3/2 as many written articles as mustafá has