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5j+6c=32 

1j+3c=10

Guest Oct 18, 2017

Best Answer 

 #2
avatar+17743 
+1

If you are to solve this problem for j and for c, multiply the second equation by 2 and subtract from the first equation.

 

5j + 6c  =  32                    --->     5j + 6c   =  32

1j + 3c  =  10     --->   x2   --->     2j + 6c  =  20

 

Subtract                            --->     3j           =  12

Divide by 3                       --->                  j  =  4

 

Substitute 4 for j in the second equation:  1j + 3c  =  10     --->     1(4) + 3c  =  10     --->     4 + 3c  =  10

                                                             Subtract 4 from both sides                                              3c  =  6

                                                             Divide by 3                                                                        c  =  2

 

A solution of this set of equations is:  c = 2  and  j = 4.

geno3141  Oct 18, 2017
 #1
avatar+93305 
0

What about it?

Melody  Oct 18, 2017
 #2
avatar+17743 
+1
Best Answer

If you are to solve this problem for j and for c, multiply the second equation by 2 and subtract from the first equation.

 

5j + 6c  =  32                    --->     5j + 6c   =  32

1j + 3c  =  10     --->   x2   --->     2j + 6c  =  20

 

Subtract                            --->     3j           =  12

Divide by 3                       --->                  j  =  4

 

Substitute 4 for j in the second equation:  1j + 3c  =  10     --->     1(4) + 3c  =  10     --->     4 + 3c  =  10

                                                             Subtract 4 from both sides                                              3c  =  6

                                                             Divide by 3                                                                        c  =  2

 

A solution of this set of equations is:  c = 2  and  j = 4.

geno3141  Oct 18, 2017

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