SOLUTION: Please help me with this problem: Find all solutions of the given system of equations and check your answer graphically. If the system is dependent, express your answer in term

Question 793217: Please help me with this problem:
Find all solutions of the given system of equations and check your answer graphically. If the system is dependent, express your answer in terms of x, where y = y(x).)
0.3x + 0.1y = 0.7
0.4x − 0.4y = 1.2

Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
I would first multiply both sides of the equal sign times 10 (in both equations) to get

The second equation can be simplified by dividing both sides by 4 to get

--> and substituting into we get
-->-->-->-->-->
Then substituting into , we get
-->-->-->

--> goes through the points
(0,7) because means and
(3,-2) because means
goes through the points
(0,-3) because means -->--> and
(3,0) because means -->
Plotting the two points found for each line and connecting then, we get

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