1 more question!! Show me how to do these math problems. Please Look??

Question

Evaluate Each Expression

5y - x for x = 8 and y = -11

3x + 5y + z for x = 18, y= 9, and z = 4

8x + 4y - 2z for x = 5, y = 17, and z = -8

-y for y = 4.

Can you please show me how to do these because this stuff is frustrating. I might put sum more on here.

Answer 1

its actually easier than it looks. you have (for the first problem)...

x= 8

y= -11

and your problem is 5y- x.

All you need to do is substitute your y and x into the problem. you should end up with a problem that looks like this...

5(-11) - (8)

all you have to do is put the numbers into the place with their corresponding letters. the rest of the problem should be a piece of cake ;)

the other problems are just the same. substitute x, y, and z, into all the places in your problem. and solve!

Hope this helps!!!

Answer 2

5y-x for x=8 and y= -11       plug in those #'s 8 for x and -11 for y



5(-11)-8 = -55-8= -63

3x + 5y + z       x=18  y=9  and z=4    3(18) +5(9) + 4

                                                         54     + 45  +4=103

And so on. Hope this helps

Answer 3

5y-x

5(8)-11

40-11  and do the rest