In order to solve the system of equations below, harvey multiplies each equation by a constant to eliminate the x terms.
7x+3y - 5
2x+5y = -11

what are the resulting equations?

a. 14x+6y= 10
-14x-35y=77

b. 14x+by = 10
-14x+35y = 77

c. 14x+by = 10
-14x-35y =-77

d. -14x-6y=10
14x+35y=-77

step-by-step explanation:

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a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional