Question

For the equation 2x-5y=25 work out x when y=1

Answer 1

2x-5y=25

2x-5 (-1)=25

2x-5=25+5

2x/2=30/2

x = 15

Answer 2

x= 15
.times -5 by 1 since x=1
.add 5 on both sides so we end up with
2x=30
.then divide by two on both sides to get
x=15