Graph 3x + 9y = -21 and check on your calculator.

What is the x-intercept, the y-intercept, and the slope?

Question

Graph 3x + 9y = -21 and check on your calculator. 

What is the x-intercept, the y-intercept, and the slope?

katrinakaif · Answer

First convert that given equation into a y = mx + b format Can you do that for me?

anonymous · Answer

21(3)+9 = Y

anonymous · Answer

Right? o.o

katrinakaif · Answer

Hmmph. No. Can you try again?

anonymous · Answer

:/ Damnit.  I know  b = y intercept and m = the slope. Thats all I know. ; - ; Sooo...Y= 3x+9?

katrinakaif · Answer

Hmm
Your equation is: 
3x + 9y = -21 

Your first step is to bring the 3x onto the other side of the equal sign. How do we do that?

anonymous · Answer

Divide because the only thing the x and the 3 have in common is they are being multiplied?

katrinakaif · Answer

We would only do that if we needed to have x alone.

anonymous · Answer

Oh. :/ Then we subtract nine from nine and -21?

katrinakaif · Answer

Ah, can you follow me on a Twiddla session? This mini box would take a while to explain :/

anonymous · Answer

Twiddla?

katrinakaif · Answer

Its a free online whiteboard