Question

8x-7 + 9x=15+ 7x pls answer this​

Answer 1

Answer:

8x-7 + 9x=15+ 7x

doing by all methods

1 systematic method

=8x-7 + 9x=15+ 7x

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides 17x -7 +7 =15 +7x+7

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides 17x -7 +7 =15 +7x+7 17x =22+7x ( on simplifying)

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides 17x -7 +7 =15 +7x+7 17x =22+7x ( on simplifying)subtract 7x from both sides

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides 17x -7 +7 =15 +7x+7 17x =22+7x ( on simplifying)subtract 7x from both sides 17x-7x =22+7x-7x

=8x-7 + 9x=15+ 7x17x -7 =15+7x (on simplifying)add 7 with both sides 17x -7 +7 =15 +7x+7 17x =22+7x ( on simplifying)subtract 7x from both sides 17x-7x =22+7x-7x 10x=22

therefore , x =22 /10

2 transposition method

8x-7+ 9x =15+7x

8x-7+ 9x =15+7x17x -7 =15+7x

8x-7+ 9x =15+7x17x -7 =15+7x 17x -7x-7 =15

8x-7+ 9x =15+7x17x -7 =15+7x 17x -7x-7 =1510x-7 =15

8x-7+ 9x =15+7x17x -7 =15+7x 17x -7x-7 =1510x-7 =1510x=15 +7

8x-7+ 9x =15+7x17x -7 =15+7x 17x -7x-7 =1510x-7 =1510x=15 +7 10x = 22

8x-7+ 9x =15+7x17x -7 =15+7x 17x -7x-7 =1510x-7 =1510x=15 +7 10x = 22 x =10/22

3 trial and error method

value x L.H.S R.H.S

value x L.H.S R.H.S 1 8-7+9=10 15+7=22. no

value x L.H.S R.H.S 1 8-7+9=10 15+7=22. no 2 16-7 +18=27. 15 + 14=29 no

value x L.H.S R.H.S 1 8-7+9=10 15+7=22. no 2 16-7 +18=27. 15 + 14=29 no 3. 24-7+27=44. 15+21=36no

solve till answer. will come 10/22

thanks

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