36.8k views
1 vote
Solve for x and y when the equation is 3x³ = 9y and 4x = 51y?

User Bcarothers
by
7.8k points

1 Answer

4 votes

Final answer:

To solve for x and y in the given equations, rearrange equation 2 to get x in terms of y. Substitute this value into equation 1 and solve for y. Substitute the value of y back into equation 2 to solve for x.

Step-by-step explanation:

To solve for x and y in the given equations:

Equation 1: 3x³ = 9y

Equation 2: 4x = 51y

If we solve these equations simultaneously, we can find the values of x and y that satisfy both equations. Rearranging equation 2, we have x = 51y/4. Substituting this value of x into equation 1, we get 3(51y/4)³ = 9y.

Simplifying, we have (51y)³/4³ = 9y. Expanding and simplifying further we get 11,357y³ = 1,944y. Dividing both sides by y, we have 11,357y² = 1,944. Solving for y, y² = 1,944/11,357. Therefore, y = ±√(1,944/11,357).

Substituting this value of y back into equation 2, we can solve for x. Using the positive value of y, we have x = 51(√(1,944/11,357))/4. Evaluating this expression will give us the value of x.