4x+y=-1
4x+3y=-8

Question

4x+y=-1
4x+3y=-8

lyrae · Answer

$$4x+y=-1 \rightarrow 4x =-1 - y$$$$4x+3y=-8$$
$$(-1 - y)+3y=-8 \rightarrow 2y = -7 \rightarrow y = -7/2$$$$4x=−1−(-7/2) \rightarrow 4x = 5/2 \rightarrow x = 5/8$$

lyrae · Answer

Correction:
$$4x=−1−(−7/2) =5/2 \rightarrow x=5/8$$

hartnn · Answer

still need help ?

anonymous · Answer

yeah

hartnn · Answer

subtract the 2 equations, what u get ?

anonymous · Answer

Do you need the steps in elimination or substitution?

anonymous · Answer

$$4x+y=-1[1]$$
$$4x+3y=-8[2]$$
$$[2]-[1]$$
$$(4x+3y)-(4x+y)=(-8)-(-1)$$

anonymous · Answer

-2y=7
y=-3.5

hartnn · Answer

thats correct, what about 'x' ?

anonymous · Answer

8x=-9
x=-1.125

hartnn · Answer

4x-3.5=-1
4x = -1+3.5
4x = 2.5
x= 2.5/4 or 5/8
how you got 8x=-9 ?

anonymous · Answer

wait, but y is supposed to be add...you know where it says 4x-3.5 , it's supposed to be 4x+3.5

anonymous · Answer

right?

hartnn · Answer

but y itself is negative, 
4x + (-3.5)
= 4x-3.5

anonymous · Answer

ok here is my solution for y...
                  4x+y=-1
                 4x+3y=-8
                       2y= 7
                       y=3.5       how did you get -3.5?

hartnn · Answer

3y-y = -8 -(-1) = -8+1 = -7
so, 2y =-7 
y= -7/2 = -3.5

hartnn · Answer

-8-(-1)  is actually -7

anonymous · Answer

ohhhhh, ok thank you it's clear now