Question

Solve the system of equations by the addition method.



Choose one answer.
a. (-1, 3)
b. (1, 3)
c. (-1, -3)
d. (1, -3)

Answer 1

its easy

Answer 2

-14x - 35y = 119 (multiply by 7)
14x - 6y = 4
add these functions:
-41y = 123
y = -123/41
y = -3
Substitute y = -3 into one of the equations:
7x -3(-3) = 2
7x + 9 = 2
7x = -7
x = -1
so the answer is : (-1, -3)
Please check my arithmatic. You can recheck by plug in x = -1, y = -1 into both equations and they should be true.

Answer 3

note that the 2nd equation I multiplied across by 2