Question

Solve the following system of equations by the substitution method.

10x + 10y = 1

x = y - 3

What is the value of y?

-29/20
31/20
-3/2

Answer 1

Substitute x = y - 3 in the first equation and you should get :
10 ( y - 3 ) + 10y = 1
10y - 30 + 10 y = 1
Can you solve it now?

Answer 2

no

Answer 3

Okay, let's solve it further.
20y - 30 = 1
Now what do you do?

Answer 4

umm

Answer 5

Lol, still didn't get it? :)

Answer 6

no

Answer 7

20y = -29
So,
\[y = \frac{ -29 }{ 20 }\]

Answer 8

o ok thanks i get it now