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Gnoma [55]
3 years ago
7

Please help! Write in y=mx+b

Mathematics
1 answer:
KIM [24]3 years ago
8 0

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

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