A. Write the linear equation ax + by = c in the form y = mx + b and vice versa.
1) 4x = - y - 7
2) 7 = 3x - y
3) -3y = 12 + 4x
4) y = 1/2 x - 14
5) y = -x + 8
1) 4x = - y - 7
2) 7 = 3x - y
3) -3y = 12 + 4x
4) y = 1/2 x - 14
5) y = -x + 8
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Answer:
1. 4x = -y - 7
y = -4x - 7
2. 7 = 3x - y
y = 3x - 7
3. -3y = 12 + 4x
(-⅓) (-3y) = (4x + 12)(-⅓)
y = -4x/3 - 4
4. y = ½x - 14
-½x + y = -14
(-2)(-½x + y) = (-14)(-2)
x - 2y = 28
5. y = -x + 8
x + y = 8