Multiply Eq1 by 3 and Eq2 by -4 and add:
15x - 12y = -21
-12x + 12y = 84
Sum:3x = 63, X = 21.
In Eq1, replace x with 21 and solve for y:
15*21 - 12y =-21, 315 - 12y=-21,
-12y = -336, Y = 28.
5x-4y=-7
3x-3y=-21
(linear combination method)
1 answer
1 answer