SOLUTION: Please help me solve this problem by the elimination method. I am having a lot of trouble understanding how to solve for y after I solve for x. And I have a problem solving for x

Question 362918: Please help me solve this problem by the elimination method. I am having a lot of trouble understanding how to solve for y after I solve for x. And I have a problem solving for x when a fraction is involved as is in this problem.
0.3x - 0.2y=4
0.4x - 0.5y=-55/17
I understand that the first equation will be 0.3x = 4, and the second will be 0.4x=-55/17;
Don't know what to do after this. I do not get the elimination method.
Thank you.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
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If you don't like fractions or decimals, get rid of them by multiplying.
Multiply both equations by 10 to get rid of decimals.
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Now multiply the second equation by 17 to get rid of the fraction.
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OK now you have 2 equations and you want to get rid of one variable.
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If you multiply the first equation by 85 and the second equation by (-2) and add them, you can eliminate and solve for .

Now that you have , use either equation to solve for .
Both equations will work.
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