Math
SOlve for 3a+5u=17 and 2a+u=9
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Asked by
AnneS2
Last updated by
anonymous
2a+u=9
2a+u-2a=9-2a
u=9-2a
3a+5u=17
3a+5(9-2a)=17
3a+(5)(9) (5)(-2a)=17
3a+45-10a=17
45-7a=17
45-7a-45=17-45
-7a=-28
-7a/-7=-28/-7
a=4
u=9-2a
u=9-2(4)
u=9-8=1