$\left \{ {{4x-7y=3} \atop {x-7y=15}} \right. \\\\
 \left \{ {{4x-7y=3} \atop {x=15+7y}} \right. \\\\ substitution\ method\\\\
4*(15+7y)-7y=3\\\\
60+28y-7y=3\\\\
60+21y=3\ \ \ \ | subtract\ \\\\
21y=-57\\\\
y=-\frac{57}{21}=-\frac{19}{7}\\\\
x=15+7*(-\frac{19}{7})=15-19=-4\\\\\ Solution :\ \left \{ {{y=-\frac{19}{7}} \atop {x=-4}} \right.$

5 0

4 years ago

Robert had some friends at his house after school. His mom cut up 2 pies for them to eat. If she cut each pie into fourths, how

marta [7]

Answer:

8/8

Step-by-step explanation:

There are two pies, and each one was cut into fourths. There are four fourths in a whole, and since there are two wholes, there are two four fourths (I don't know if this makes sense).

Basically, multiply how many fourths (four per pie) by how many pies there are.

4 x 2 = 8

There are 8 pieces.

6 0

2 years ago

Read 2 more answers

5639 watts equals 5.639 kilowatts<br> True or false

otez555 [7]

Answer:

True

Step-by-step explanation:

Simply, follow the conversion formula:

1 kilowatt = 1000 watts.

5639 watts/1000 = 5.639 kilowatts

3 0

3 years ago

Read 2 more answers