3x+4y=9

4x-37=-13

3x+4y=9

4x-37=-13

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Olney, MD

3x+4y=9

4x-37=-13

4x-37=-13

OK, you did write the equations down incorrectly. They should be:

3x+4y = 9

4x-3y = -13

Let's re-write them in standard form y = mx+b

3x+4y = 9

4y = 9 - 3x

y = (9/4) - (3/4)x

4x-3y=-13

-3y = -13 - 4x

y = (13/3) + (4/3)x

Now set the two equations equal. This is the point where the two lines intersect:

(9/4) - (3/4)x = (13/3) + (4/3)x

(9/4) - (13/3) = (4/3)x + (3/4)x

-25/12 = (25/12)x

Solve for y by plugging x = -1 into either original equation:

3x + 4y = 9

3(-1) + 4y = 9

-3 + 4y = 9

4y = 12

Answer is (-1,3)

West Richland, WA

Are you supposed to use substitution, elimination or graphing?

Graphing

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