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(1) 4a-5b=7

(2) 4a+5b=17

(1)-(2) gives 4a-5b-(4a+5b)=7-17 then -10b=-10 so b=1

from (2) one gets 4a=17-5b=17-5x1=12 so a=3

(3,1) is the solution

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โˆ™ 2011-06-08 20:40:10
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Q: What is the order pair for 4a - 5b equals 7 and 4a plus 5b equals 17?
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