HELP!!
1.) 2x+y=-1
x+ 4y=-10
By substituting.

2.) 2x+y=-1
3x-y=16
By graphing.

Question

HELP!!
1.) 2x+y=-1
     x+ 4y=-10
By substituting.

2.) 2x+y=-1
      3x-y=16
By graphing.

anonymous · Answer

Find the values for x from second equation first..

anonymous · Answer

1)
2x+y= -1.......(1)
x+4y = -10......(2)
from (2)
x = -10-4y....(3)
subst (3) into (1)
2(-10-4y)+y = -1
solve for y

anonymous · Answer

$x = -10 - 4y$

Now plug this in first equation :

$2(-10 - 4y) + y = -1$

$-20 - 8y + y = -1$

$-7y = 19$

Find y from here and then find x by plugging the found value of y in any one equation..

anonymous · Answer

graphing you would need a graph paper. sketching the graph is not enough.
convert the equations into y = mx +c format
m is the gradient and c is the vertical intercept.
the intersection points are the solutions for x and y

anonymous · Answer

@irkiz  Is the answer suppose to be a decimal???

anonymous · Answer

For y you can simply write :

$$y = - \frac{19}{7}$$

anonymous · Answer

@waterineyes i tried that already and it's not right!

anonymous · Answer

Let me check once again then..

anonymous · Answer

y is coming right according to me..

anonymous · Answer

so y = -2.11 ?

anonymous · Answer

Yes it is..

anonymous · Answer

NO..

anonymous · Answer

It is : y = -2.71

anonymous · Answer

You know what thanks for the help but nevermind because i keep trying to figure it out & it's not happening because i keep getting -2.111111111111. So idk...