4 years ago

For the following system, subtract the second equation from the first equation.

Mathematics

1 answer:

Finger [1]4 years ago

5 0

3x - 4y = 7
-(3x + 2y = -5)
-3x -2y = 5
3x - 4y = 7
-6y= 12

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andre [41]

Answer:

Step-by-step explanation:

3x and 2x are same- side interior angles and sum to 180° , that is

3x + 2x = 180

5x = 180 ( divide both sides by 5 )

x = 36 → C

3 0

2 years ago

Graph this equation 3x+4y=12

Burka [1]

$3x+4y=12 \ \ |\ subtract\ 3x\ to\ both\ sides \\\\ 4y=-3x+12 \ \ | \ divide \ both \ sides\ by\ 4\\\\ y=-\frac{3}{4}x+3\\\\x=-4 \ \ \to \ \ y= -\frac{3}{4}x+3=-\frac{3}{4} \cdot (-4)+3=3+3=6\\\\x=8 \ \ \to \ \ y= -\frac{3}{4}x+3=-\frac{3}{4} \cdot8+3=-6+3=-3$