Final answer:
To solve for x given y = -7 in the rule y = 91 - 14x, rearrange the equation to isolate x and simplify. You'll find that x equals 7.
Step-by-step explanation:
To find x when y is -7 using the rule y = 91 - 14x, substitute y with -7 and solve for x.
-7 = 91 - 14x
Now, you want to isolate the variable x, so you'll move the constant term to the left side:
-7 - 91 = -14x
Combine the constants:
-98 = -14x
Then, divide both sides by -14 to solve for x:
x = ·
x = 7
Therefore, x equals 7 when y is -7 given the rule y = 91 - 14x.