if 2x + 6y = 18,5x = 10y + 20,what is the value of x?  Options
A) 6.5 B) 5.5 C) 5 D) 6 E) 4
solution:   I--&gt;   x = 2y + 4   sub in II   2(2y + 4) + 6y = 18   4y + 6y = 10   y 4  + 6= 
<gadget id="calculator">4  + 6</gadget>
<output>10</output>
10   y= 1   sub y=1 in other equation   5x = 10(1) + 20   x = 6   answer is 6
<result>D</result>
if 2x + 6y = 18,5x = 10y + 20,what is the value of x?