Solve using the substitution method.
10x + y = –1
5x + 2y = 16

Question

Solve using the substitution method.
10x + y = –1 
5x + 2y = 16

lgbasallote · Answer

do you have an idea how to start?

anonymous · Answer

Kind of, but I'm not sure..

lgbasallote · Answer

so what's your idea?

anonymous · Answer

Multiply second equation by 2 on both sides?

anonymous · Answer

Here's a great explanation of how to solve this type of problem: http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/v/solving-linear-systems-by-substitution And I would recommend starting by solving for y in the first equation.

anonymous · Answer

See, what you can do in this in easy way,

Firstly from first equation, evaluate y in terms of x..

You can do this by subtracting 10x both the sides in first equation...

lgbasallote · Answer

@0mgl0la i think what you're attempting is elimination..note the question is asking for substitution method

anonymous · Answer

solve the first equation 
$$10x + y = –1 $$ for $y$ in one step
you get 
$$y=-1-10x$$ and then "substitute" $-1-10x$ for $y$ in the second equation, with careful use of parentheses.  then you will have one equation with one variable, namely $x$ 
try it and see what you get