Need help with 3 problems on page 167
X+2y=6
5x+3y=2
4x-3y=-20
-x-8y=5
5x+6y=-11
3x+y=-4
1. x+2y = 6
5x+3y = 2
Multiply both sides of Eq1 by -5 and add
the 2 Eqs:
-5x - 10y = -30
+5x + 3y = 2
-7y = -28
Y = 4.
In Eq1, replace Y with 4:
x + 2*4 = 6
X = 6-8 = -2.
2. Multiply both sides of Eq2 by 4 and
add the 2 Eqs.
3. Multiply both sides of Eq2 by -6 and add the 2 Eqs.