Question

-2x +y = 0
5x + 3y = -11
Can someone help me and show me the steps to solve each system by substitution?

Answer 1

-2x + y = 0
5x + 3y = -11

notice how in -2x + y = 0 when you move y to the right you get:
-2x = -y
divide both sides by -1 and you get
y = 2x

also notice how there is a "y" in 5x + 3y = -11

substitude the y in the second equation with the first and you get:

5x + 3(2x) = -11
5x + 6x = -11
11x = -11
x = -1

you can do the same with y.

Answer 2

make -2x+y=0 into y=+2x and then input this into the next equation for y and that becomes 5x+3(2x)=-11 so solve that and it becomes 5x+6x=-11 than 11x=-11 and that becomes x=-1 then plug x=-1 into the original equation so it becomes
-2(-1)+y=0 and that becomes y=2

Answer 3

i solved for both y and x :P

Answer 4

i just solved for x ^^;

Answer 5

Now I just need to make sense of it. Thanks!