Question

How do I solve this? 2x+10y=80
2x-5y=5
Help please!!

Answer 1

I need to solve for x and y

Answer 2

subtract the bottom equation from the top one then solve for y

Answer 3

?

Answer 4

So subtract 80 by 5

Answer 5

2x + 10y = 80
-(2x + 5y = 5)

Answer 6

yep

Answer 7

you would get
2x + 10y = 80
-(2x - 5y = 5)
= 0x + 15y = 75

Answer 8

So the answer would be 15

Answer 9

Almost. You're left with 15y = 75. You now need to solve for what y is by dividing.

Answer 10

If y is 15 I'll plug my answer back in for x

Answer 11

So Y is 5. Will I plug that into 2x+10y=80?

Answer 12

yes you can plug it in to either equation to find x

Answer 13

So x is 7 right?

Answer 14

just plug y into 2x -5y = 5

2x - 5(5) = 5

2x - 25 = 5
2x = 30
x = 15