can someone please help my question is what is the max value for y or equal to 3x-5 and x or equal to-5 and then it gives me f(x,y)=-3x+4y? my second question is how do you solve this system using matricies 8x+7y=5 and 4x-9y=65?

Question

can someone please help my question is what is the max value for y> or equal to 3x-5 and x< or equal to -1/2x+2 and x> or equal to-5 and then it gives me f(x,y)=-3x+4y? my second question is how do you solve this system using matricies 8x+7y=5 and 4x-9y=65?

anonymous · Answer

the choices for the first question is a.-10 b.-2 c.78 d.95
for the second a.(-5,5) b.(5,65) c)(7,-7) d(65,5)

anonymous · Answer

yea sorry i went to the restroom

anonymous · Answer

$$y \ge 3x-5$$            $$y \le -1/2x+2$$         $$x \ge -5$$

anonymous · Answer

and then it gives me f(x,y)=-3x+4y

anonymous · Answer

oh the one on the comment sorry

anonymous · Answer

y not the x so y<orequal to -1/2x+2

anonymous · Answer

yea but idk where to go to find one
whats a good website

anonymous · Answer

messed up sorry

anonymous · Answer

is it better

anonymous · Answer

nevermind i found the answer thank you for the help bye

ranga · Answer

For what it is worth, here are the steps to a similar problem: http://www.algebra.com/algebra/homework/Graphs.faq.question.548265.html