Question

solve each stystem of equations by substitution.
1. y= -5 y=3x+4

2. y= -6 y=-2x +4

3. y=x y=5x - 8

4. y= -4 y= -3x - 1

5. x= 2 y= 4x - 5

6. y=x y= -2x + 9

Answer 1

Just stick the y value into the equation and solve.
1. -5 =3x + 4 To get x by itself -4 from both sides
-5 - 4 = 3x + 4 - 4
So -9 = 3x Now divide both sides by 3
-3 = x

The rest are the same way.