Answers

2014-09-25T22:12:07+08:00
2x+y=4
2(1)+2=4
2+2=4
4=4 
TRUE
0
2014-09-25T22:44:48+08:00
Linear equation in the form of Ax+By=C to be transpose as y=mx+b...

-20x+5y= 30
5y = 20x + 30
(5y = 20x + 30) 5
y = 4x + 6

substitute ....

y = 46
x = 10

check....

46 = 4(10) + 6
46 = 40 + 6
46 = 46 
0