Question

which ordered pair is a solution of the equation y=5x ...

(2,10)
(-5,25)
(-3,15)
(-2,-10)

Answer 1

There are 2 choices here that are solutions of that equation. Replace x in the equation with the x coordinate of your ordered pair, and what you get as a result, y, should be the same as your y coordinate in your ordered pair.

Answer 2

The first ordered pair is (2,10). x is 2 and y is 10 in this ordered pair. In your equation, replace the x with a 2 to get y = 5(2). 5*2 = 10 and the y coordinate in this pair is 10, so that ordered pair is a solution. For the next one, x is -5 and y is 25. If we replace the x in our equation with -5, the result should be 25 according to the y coordinate. Does 5(-5) = 25? No, it doesn't, it equals -25. So this is not a solution. That's how you do these. There is one more in your choices that will work as well as the first one. Let me know if you still don't understand.