6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution

ANSWER

B. infinite solutions

EXPLANATION

We want to solve the equation;

and

We multiply the second equation by 3 to get:

We now subtract equation (1) and (3).

This implies that

Hence the equation has infinitely many solutions.

4a) 135×11/5= 297 miles

b) 216/27= 8 gallons (27miles is the distance one gallon can go)

5) 4+3+4=11

4/11 × x=160

4x=1760

x= 440

6) $4.20/14= $0.3...cereal A

$3.90/12= $0.325...cereal B

Cereal A os the better buy

7) 4×30/3= 40 presents

Hope it's all correct :-)