Chris is a college student who can work a maximum of 40 hours per week. he needs to make at least $900 in order to cover his expenses. his tutoring job pays $25 per hour and he also makes $15 per hour refereeing soccer matches. find the constraints for this situation and determine which point is a valid solution to the system, where x is the number of hours chris spends tutoring and y is the number of hours he spends refereeing.

Equation 1: x + y = 40 ; therefore y = 40 - x
Equation 2: 25x + 15y = 900
Find x first:

25x + 15 (40 - x) = 900
25x + 600 - 15x = 900
10x = 900 - 600
x = 300÷10
x = 30 hours Chris needs to spend for tutoring job

y = 40 - 30
y = 10 hours Chris needs to spend for referencing job

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.