Question

Please help! Write in y=mx+b

Answer 1

Answer:

1.  $y = 3x -1$

2. $y = -2x - 2$

3.  $y = -x - 4$

Step-by-step explanation:

we already know the slope of the three lines.

We know that the equation of a line is

$y = mx + b$

We only need one point.

1. First graph

$m = 3$

pto (1, 2)

Then the equation is:

$y = 3x + b$

Now we substitute the point in the equation and clear b.

$2 = 3(1) + b$

$b = -1$

Finally the equation is:

$y = 3x -1$

2. Second graph.

$m = -2$

pto (-2, 2)

Then the equation is:

$y = -2x + b$

Now we substitute the point in the equation and clear b.

$2 = -2(-2) + b\\b = -2$

Finally the equation is:

$y = -2x -2$

3. Third graphic

$m = -1$

pto (-1, -3)

Then the equation is:

$y = -x + b$

Now we substitute the point in the equation and clear b.

$-3 = -1(-1) + b$

$b = -4$

Finally the equation is:

$y = -x - 4$