2x-3y=5
10x+10y=30
what is the solution?

Question

anonymous · Answer

Multiply first equation by 5. Then add.

myininaya · Answer

how about -5 
and then after add the equations

myininaya · Answer

5 is fine
we would just have to subtract which is fine

anonymous · Answer

It should be subtract. Anyway, once you multiply by 5, it will be clear whether to add or subtract to eliminate x. At least I hope.

anonymous · Answer

please elaborate

myininaya · Answer

$$-10x+30y=-25$$ multiplying the top equation by -5 gives us that

myininaya · Answer

now add this to 10x+10y=30

anonymous · Answer

whats the answer

myininaya · Answer

add those equations
(-10x+10x)+(30y+10y)=(-25+30)

myininaya · Answer

$$40y=5 => y=\frac{5}{40}$$
reduced then plug into one of the equations given and solve for x

myininaya · Answer

sorry i multiplied wrong at first
the equation was suppose to be -10x+15y=-25 after multiplying the -5

myininaya · Answer

now add the equations together

anonymous · Answer

i dont remember my teacher explaining it like that..
o.o

myininaya · Answer

$$-10x+15y=-25$$
$$10x+10y=30$$
----------------
0x+25y=5
25y=5
now divide by 25 on both sides
then reduce the fraction then plug into one of the equations given and solve for x