320,903 views
22 votes
22 votes
2. Solve the system by substitution or elimination.
4x + y = 1
3y = -6x + 27

User Bjornasm
by
2.7k points

2 Answers

20 votes
20 votes

Answer:

Explanation:

4x + y = 1
Divide 4x by 4, then do the same to the 1

4x/4 + y = 1/4

= x + y = 0.25

If you are solving for x, then the equation will look like this.

x = 0.25 - y (minus because you are moving the variable to the other side of the = sign)

If you are solving for y, then the equation will look like this.

y = 0.25 - x (minus because you are moving the variable on the other side of the = sign)

Answer solving for x = x = 0.25 - y

Answer solving for y = y = 0.25 - x

-------------------------------------------------------------------------------------------------------------

3y = -6x + 27

3y/3 = -6x + 27/3

y = -6x + 9

Bring -6x to the other side of the =.

6x + x = 9

6x/6 + y = 9/6

x + y = 1.5

Then you have to move the variable depending on which one you are going to solve for.

Answer solving for x = 1.5 - y

Answer solving for y = 1.5 - x

Hope this helps!

User Vjardel
by
3.1k points
9 votes
9 votes

Answer:

(2, -7)

Explanation:

4x + y = 1 3y= 6x + 27

y = 1 - 4x

3(1 - 4x) = 6x + 27

3 - 12x = 6x + 27

-12x = 6x + 24

-18x = 24

6/3

2

y = 1 - 4x

y = 1 - 4(2)

y = 1 - 8

y = -7

4x + y = 1

User BigMiner
by
2.8k points