Question

Solve the equation 4x + 5y = 9 for x.

x equals negative 5 times y plus 9 over 4
x equals negative 5 over 4 times y plus 9
x equals the quantity 5 times y plus 9 end quantity over 4
x equals the quantity negative 5 times y plus 9 end quantity over 4

Answer 1

(d) x equals the quantity negative 5 times y plus 9 end quantity over 4

Explanation:

You want to solve for x: 4x +5y = 9.

Solution

This can be treated like any other 2-step equation. First isolate the variable term of interest. Then divide by its coefficient.

4x = -5y +9 . . . . . . subtract 5y

x = (-5y +9)/4 . . . . . divide by 4