Question

Which lines have negative slopes?
Choose all answers that are correct.

A. 2x – 2y = 6
B. y = –5
C. x + 4y = 8
D. –3x – 5y = 15

Answer 1

@jim_thompson5910

Answer 2

You could make this problem a bit easier by solving each of the given equations for y first. You'll end up with equations of the form y=mx+b. If you'd do that, you'd find it quick and easy to choose the answer (or answers) that have negative slope(s).

Answer 3

OK, hold on while I do that. :)

Answer 4

B and D @mathmale?

Answer 5

@Miracrown @e.mccormick @mathmale @aaronq @mathgeek27

Answer 6

D is correct, but not B. y = -5 is same as y = 0x - 5. Note that m is 0, so slope is zero.

Zero is not negative number, so B is incorrect.

Answer 7

Two of the given answers are correct. You got D.

Which is correct answer? A or C?

Can you do what @mathmale said and solve for y? What do you get for A and C?

Answer 8

C?

Answer 9

@geerky42

Answer 10

@jim_thompson5910 Can you help? I was suppose to be in bed an hour ago and this is my last question. @geerky42 isn't responding.

Answer 11

@Polkapen @mathmale @geerky42

Answer 12

Sorry, yes C is correct answer.

So C and D are correct answers.

Answer 13

It is always best to do the math first and see what you get. This develops skills you need in later math classes. However, you may want to use a graphing tool to check your work:
https://www.desmos.com/calculator