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Question

Solve the following equations by trial and error
method:

(1)x10=5

(2)a7+8=6

(3)x2+6=9

(4)19=x+13

(5)x4=9

(6)2x+4=3x4

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Solution

(1)
x10=5x= should be multiple of 5
x=5 55
x=10 05
x=15 5=5
x=15
(2)
97=2 a is multiple of 7
x=14 2=2 a=14
(3)
x2=3 X=3
(4)
19=x+13x=6
(5)
x4=9 x is multiple of 4
x=36 364=9 9=9
(6)
x=8

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