Given: x y = 10. if x = -21, what is y ?

y= -10/21

Step-by-step explanation:

Hi, to answer this question we have to solve the equation given:

xy =10

So, we have to replace the value of x (variable)  in the expression by the number -21.

If x=-21,  

(-21) y =10

Solving for y:

y= 10/-21  

y= -10/21or -0.47 (decimal form)

Feel free to ask for more if needed or if you did not understand something.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

12cm

the answer is d