SOLUTION: I know it says not linear equations but can someone please help me with this one? Thank You! Thanks Again!

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Question 58181: I know it says not linear equations but can someone please help me with this one? Thank You!


Thanks Again!
Answer by rcmcc(152) About Me  (Show Source):
You can put this solution on YOUR website!
to solve we isolate y to solve for x
0.5x-0.3y=7
move the x to the side
-.3y=7-.5x
0.3Y=-7+0.5X
divide both sides to isolate y
Y=(-7/.3)+(0.5/0.3)X
now you substitute in the new equation for y in the second equation

0.3x-0.4((-7/.3)+(0.5/0.3)X)=2
expand the terms into the brackets and simplify the term
0.3X+(28/3)+-(2/3)x=2
11/30X+(28/3)=2
subtract (28/3) from each side
11/30X=-22/3
divide out 11/30 from each side to isolate x
x=-20
now substitute x into the equation to find y
0.5(-20)-0.3y=7
-10-.3Y=7
add 10 to each side
-.3Y=-3
divide by .3
y=10
so x is -20 and y is 10