DarkBlaze347

Click the "2nd" button, then click the desired function.

Let's solve this one with elimination:

-3x+7y=-16

-9x+5y=16

Multiply the top equation by 3 so we can isolate the y's.

-9x+21y=-48.

-9x+5y=16.

Subtract: 16y=-64, y=-4.

Plug the y value into any of the original equations you like.

-3x-28=-16.

-3x=12.

x=-4.

The lines intersect at the point (-4,-4)

It's a number that has more than 2 factors.

4,9, and 27 are examples.

Just divide 1000 by 6 2/3, and that's your answer in seconds.

It will take him 150 seconds, or 2.5 minutes to run 1000 meters.

Add 7y to both sides: 15y-8=37.

Add 8 to both sides: 15y=45.

Divide both sides by 15, y=3.

Check: 8(3)-8=37-7(3), 24-8=37-21, 16=16

Multiply the numerators: 1*2=2.

Multiply the denominators: 7*3=21

(1/7)*(2/3)=2/21

-9.2-9.4=-18.6

-18.6-0.4=-19

Use the foil method to expand (x-1)(x+2): x^2+2x-x-2=x^2+x-2.

x^2+x-2=18, subtract 18 from both sides so we can use the Zero Product Property:

x^2+x-20=0.

Factor: (x+5)(x-4)=0.

Use the zero product property so that x+5=0, and x-4=0.

x has two solutions, -5 and 4.

Add 2x to both sides: 3x+9=18.

Subtract 9 from both sides: 3x=9.

Divide both sides by 3: x=3

Find the prime factorization of 1230, which is 2*3*5*41.

2,3,5, and 41 aren't perfect squares, however, which means √1230 is already in simplest form.