Question

solve using elimination method
0.3x-0.2y=4
0.5x+0.5y=-15/19

Answer 1

panther77 didn't we just work on this one earlier?

Answer 2

i thought it was a different one but i may be wrong sorry

Answer 3

no it's the same.

Answer 4

i'll eliminate y in order to get the value of x
you can also elimiate the x first.
so i multiplied the first equation by 5
and multiplied the second equation by 2

1.5x - y = 20
x+ y = -30/19
----------------- +
2.5x = 20 - 30/19
2.5x= (380-30)/19
2.5x = 350/19
x = 140/19

then plug the value of x into one of those equations to get the value of y

Answer 5

im sorry how would i figure y im unsure with the fractions?

Answer 6

put the value of y to this equation
0.3x-0.2y=4
you can substitute x with 140/19, as we've got x from elimination before.
0.3(140/19) - 0.2y=4

or this
0.5x+0.5y=-15/19
0.5(140/19) - 0.5y = -15/19

yeah the fraction makes the calculation difficult. are you sure the second equation is 0.5x+0.5y=-15/19? why dont you check your question again...

Answer 7

yes that is correct

Answer 8

ok, then it's just a matter of calculation
0.5(140/19) - 0.5y = -15/19
-0.5y = (-15/19) - (70/19)
-0.5y=-85/19
y=170/19