Homework Help: math

Posted by john on Saturday, April 28, 2012 at 12:11pm.

An exam consists of two parts, Section X and Section Y. There can be a maximum of 80 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two sections. Then solve the system by graphing.

math - Henry, Sunday, April 29, 2012 at 8:13pm
X + Y =< 80.
Y => x+20.

X + (X+20) =< 80.
2x+ 20 =< 80.
2x =< 80-20.
3x =< 60.
X =< 20.

Y => 20 + 20.
Y => 40.

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