Question

Solve the following systems of linear equations using elimination or substitution

1. 2x+5y=-5 and x+3y=3
2. 4x+4y+-16 and 2x+8y=10
3. -x-5y=-13 and 2x+2y=-6
4, 2x+y=-1 and -4x+6y=6

Please help

Answer 1

for substitution you want to solve for x or y in one of the equations (doesn't matter which) and then plug that equation into the other equation

for example:
2x+5y=-5 and x+3y=3

x=3-3y
so
2(3-3y)=5y=-5
and solve for y
when you find y, you can plug it into x+3y=3 to find x

for elimination you want to eliminate one of the variables.
for example: 2x+y=-1 and -4x+6y=6
multiply 2x+y=-1 by 6
12x+6y=-6
and then subtract -4x+6y=6
BUT REMEMBER TO DISTRIBUTE THE MINUS SIGN


so you get 16x=-12 and solve for x
you can plug what you get for x into 2x+y=1 to find y

Answer 2

hopefully you can do the others on your own now :)