Question

Solve the system of equations below.





A. (-1,4)
B. (1,4)
C. (4,1)
D. (-4,1)

Answer 1

multiply the first equation by 2 and the second by 3 to make the y terms 6y and -6y . Then add them to get an equation in x.
Note you need to multiply EACH term in the equations.

Answer 2

5x - 2y = 18 --->(3)
3x + 3y = 15 -->(2)
-----------------
15x - 6y = 54 -- result of multiplying by 3
6x + 6y = 30 -- result of multiplying by 2
----------------add
21x = 84
x = 4

now sub 4 in for x in either of the original equations
5x - 2y = 18
5(4) - 2y = 18
20 - 2y = 18
-2y = 18 - 20
-2y = -2
y = 1

.x = 4 and y = 1 so c?

Answer 3

I'll do the first part for you
3x + 3y = 15

multiply by 2:-

6x + 6y = 30

Answer 4

wow - that was fast!

you are right