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avatar+786 

3x+4y=72 i need the x and y intercepts

 Aug 30, 2018
 #1
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+1

x-intercept = 24

y-intercept = 18

 Aug 30, 2018
 #2
avatar+100516 
+2

3x  + 4y    = 72

 

To find the  y intercept, let  x  = 0  and we have

 

3(0)  + 4y  = 72

4y  = 72    divide by 4

y   =   18

 

To find the  x  intercept, let  y  =0  and we have

3x  + 4(0)   = 72

3x  = 72  divide by 3

x  = 24

 

 

 

cool cool cool

 Aug 30, 2018
 #3
avatar+786 
+1

thanks guys

 Aug 31, 2018
 #4
avatar+22172 
+3

3x+4y=72

I need the x and y intercepts.

 

\(\begin{array}{|rcll|} \hline 3x+4y &=& 72 \quad & | \quad :72 \\\\ \dfrac{3x+4y}{72} &=& 1 \\\\ \dfrac{3x}{72} + \dfrac{4y}{72} &=& 1 \\\\ \dfrac{x}{\dfrac{72}{3}} + \dfrac{y}{\dfrac{72}{4}} &=& 1 \\\\ \dfrac{x}{24} + \dfrac{y}{18} &=& 1 \\\\ \text{x-intercept}~ = 24, \text{if }~y=0\\ \text{y-intercept}~ = 18, \text{if }~x=0\\ \hline \end{array}\)

 

laugh

 Aug 31, 2018

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