Question 181157
x+4y=14
2x-y=1 
Here are some of the ways I tried to solve it;
x(2x + 1) + 4y = 14 
2(14-4y)-y=1
I tried moving the equation around like: y=2x +1 and x=14-4y.
I have spent over 2 hours on this question. The answers in the book are (2,3). Please help!!
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I tried moving the equation around like: y=2x +1 and x=14-4y.
You were on the right track there.
To use substitution, you solve for one of the variables, then sub into the other equation.
Take this one: y=2x +1
and sub for y into the other eqn.
x + 4*(2x+1) = 14
x + 4x+4 = 14
5x = 10
x = 2
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That's one.  Then sub 2 for x into either eqn.
2x-y=1
2*2 - y = 1
4 - y = 1
-y = -3
y = 3