Question

determine the best method to solve each system o equation.then solve the system.
1.4x=2y-10; x+2y=5
2.x=-2y; 4x+4y=-10
3.2s-3t=42; 3s+2t=24
4.4a-4b=-10; 2a+4b=-2
5.4x+10y=-6; -2-10y=2
6.2x=y-3; -x+y=0

Answer 1

1. Go for substitution as you can let y=2x so you get in second equation x+4x=5
5x=5, x=1, y=2

2. Since x=-2y again substution. -8y+4y=-10, -4y=-10 y=5/2, x=-5

Answer 2

1st equation times -3: -6s + 9t=-126
2nd equation times 2: 6s +4t = 48 add
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13t =-78
t= -6
Now substitute -6 for t in first equation in 3. 2s+18=42,
2s=42-18=24
s=12

Answer 3

I have done the first half, using both typical methods, you can continue with the last half.