Maria wants to solve the following system using the elimination method: 4x + 9y = 59
x + y = 17

What number should the equation x + y = 17 be multiplied by to eliminate y?

A. 4
B. -4
C. 9
d. -9

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?

X- 3 = 4 solve this algebraic expression