Question

Solve by the substitution method
15x-20y=-1
15y=1+10x

Answer 1

Minus the 10x to the other side
15x-20y=-1
-10x+15y=1

Answer 2

Then you will have to get rid of one of the variables so get rid of the x then
2(15x-20y=-1)
3(-10x+15y=1
So it will be
30x-40y=-2
-30x+45y=3
= 5y=1

Answer 3

Then you will end up as a fraction
y=1/5
Plug it into one of the equations
-10x+15(1/5)=1

Answer 4

Then you will end up with
-10x=-2
x=2/10 which can be simplified
x=1/5 & y=1/5

Answer 5

Let me check the answers...

Answer 6

Yes it is correct

Answer 7

Hello...

Answer 8

Thanx