-5a+7b=-1
3a+2b= 13
show work please

Question

-5a+7b=-1
 3a+2b= 13
show work please

campbell_st · Answer

multiply the 1st equation by 3 and the 2nd equation by 5 and add the resulting equations
to eliminate a

-15a + 21b = -3
   15a + 10b = 65
-----------------
               31b = 62
            
b = 2 

substitute b = 2 into either equation to find a

anonymous · Answer

multiply equation 1 from 2 and equation 2 from 7.. so 
equation 1= -10a+14b=-2
equation 2=21a+14b=91
 subtract equations u will get value of b

-31a=-93
a=3

now substitute a in equation 1 original..i.e=-5a+7b=-1
                                                               -15+1=-7b
                                                                      b=2

anonymous · Answer

could  you do a check step?

anonymous · Answer

|dw:1340402898122:dw| hence proved..:)