Ben mulitplies both sides of the equation 0.6x-0.4y=1.2 by 10 and obtains 6x-4y=12. Are the graphs of the two equations the same? Explain your answer.
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Answer
Equation (1) ×4 :
x
16
+12y=32
Equation (2)×3 :
x
18
−12y=−15
Add two equations ;
⇒
x
34
=17
⇒x=2
Substitute x in equation (2);
⇒y=2
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