Find an equation of joint variation. Then solve for the missing value. r varies directly as s and t. one set of values is r = 28, s = 7, t = 8, Find r when s = 12 and t = 9​

no, the equation would be invalid since they are both not equal.

step-by-step explanation:

here you got

4y-6+4y 2-9

first, you would simplify the equation on the form.

4y-6+4y 2-9

then, move all the terms that contains a y to the left and all the other terms to the right.

+4y-4y+-9-6

finally, you will simplify the left and the right side of the equation.

y=-3

d

step-by-step explanation:

the square root of what number? if you add that, then someone will probably answer the question.