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IrinaVladis [17]
3 years ago
6

What are the x- and y-interepts of the graph of 5x-4y=20?

Mathematics
1 answer:
77julia77 [94]3 years ago
8 0

Answer: x=4,y=-5

Step-by-step explanation:

Equation: 5x-4y=20

To find the x intercept make y=0 so ur left with

1)5x-4(0)=20

Then you can solve x from here

2) 5x=20

Because -4 * 0 = 0

3) x= 20/5

Because we want x by itself so we divide 5 on both side so the 5 cancels out on the left side

4) x=4

Because 20/5=4

———————————————-

You do the same thing for y make x equal to zero and that’s how you find it

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7 0
3 years ago
If a+b+c =0 show that a³+b³+c³= 3abc
slega [8]

Answer:

Step-by-step explanation:

a+b+c=0, a+b=-c,a+c=-b, b+c=-a

(a+b+c)^3=(a+b+c)^2*(a+b+c)=(a^2+b^2+c^2+2ab+2ac+2bc)*(a+b+c)=

a^3+ab^2+ac^2+2a^2b+2a^2c+2abc+a^2b+b^3+bc^2+2ab^2+2abc+2b^2c+a^2c+b^2c+c^3+2abc+2ac^2+2bc^2=a^3+b^3+c^3+3a^2b+3a^2c+3ac^2+3ab^2+3bc^2+3b^2c+6abc=

a^3+b^3+c^3+3a^2*(b+c)+3c^2(a+b)+3b^2(a+c)+6abc=

a^3+b^3+c^3+3a^2*(-a)+3c^2*(-c)+3b^2*(-b)+6abc=

a^3+b^3+c^3-3a^3-3c^3-3b^3+6abc=

6abc-2a^3-2b^3-2c^3=2(3abc-a^3-b^3-c^3)=

2*[3abc-(a^3+b^3+c^3)]=0

so 3abc-(a^3+b^3+c^3)=0

so a^3+b^3+c^3=3abc

7 0
3 years ago
Can anyone help me please i dont understand this
Katena32 [7]

Answer:

try doing this for each quesion

so you see the negative? well negative means less than more. then use your signs and try to get it done reply if you still dont understand

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
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Hope this helps explain what was needed to be solved! :)

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3 years ago
PLEASEE HELP MEEE I DONT UNDERSTAND IT
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2 years ago
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