Question

Could someone walk me through substitution method? I have a test thursday :O

x+5y=-15
5x+6y= -18

Answer 1

in the first equation subtract 5y from both sides. this gives us
x = -15 - 5y
now plug this into the second equation for x
5 ( -15 - 5y ) +6y = -18
now distribute ,collect like terms and solve for y

Answer 2

well their are 2 ways elimination and substitution method so u decide which one u want to apply so, Elimination works by adding or subtracting equations to get rid of one of the variables and u have to arrange the equation first for this one especially the first one which is x+5y=-15 so change this bring 15 to the left make it same like B.

Answer 3

http://www.mathportal.org/algebra/solving-system-of-linear-equations/elimination-method.php this is a good example for methods try this one ok.

Answer 4

Thank you! I am studying for my final on Thursday, so have to remember both methods. And of course it's comprehensive or whatever, and I did this towards the beginning of teh semester so everything is a bit foggy.

@perl thank you :D I did that but somehow got lost the first time,
@rena.r thank you for the link appreciate it.

Answer 5

Do you want me to go through the example>

Answer 6

Oh nvm

Answer 7

Thanks @apple_pi :)