if, 17x + 23y = 40 and 23x + 17y = 80. then, find the value of x + y.
Answers
Answered by
60
Step-by-step explanation:
17x+23y=40----------(1)
23x+17y=80----------(2)
multiply equation (1) with 23 and equation (2) with 17
(17x+23y=40)23
(23x+17y=80)17
391x+529y=920
391x+289y=1360
(-) (-) (-)
----------------------------
240y=-440
y=-44/24=-1.833
substitute value y in equation (2)
23x+17(-1.833)=80
23x-31.161=80
23x=80+31.161
23x=111.161
x=111.161/23=34.639
x+y=34.639-1.833=32.806
Answered by
23
Answer:
Step-by-step explanation:
Attachments:
Similar questions