Question

X-15=5 or 2x+5=1 solve the following system

Answer 1

`x-15=15\\2x+15=1\\x=5+15 \\so x=20\\2x=1-5\\2(20)=1-5 = (-4)/(2) \\x=-2\\\\`

Explanation:

Answer 2

x = 20 or x = -2

Explanation:

x-15 = 5

or, x=15+5

or, x = 20

2x+5 = 1

or, 2x= 1 - 5

or, x= -4/2

or, x= -2

if you know the rules here then its really easy to solve

the rules are

when + goes to the other side then it become - and viceversa

when × goes to the other side then it becomes ÷ and vice versa

and we did the same thing here

in x - 15 = 5

when '-15' went to the other side it became '+15' and we just solved it

in 2x + 5 = 1

when '+5' went to the other side it became '-5'

and then when 2 in '2x' went to the other side it became ÷2 because there is multiplication in bet

ween 2 and x in '2x'