Question

The value of k , if x = -2,y= -1 , is a solution of the equation 2x+3y=k is
(a) 6
(b) -7
(c) 5
(d) 1

Answer 1

Answer:

B

Step-by-step explanation:

Substitute x= -2 and y=-1 into the equation:

(2)(-2)+(3)(-1)=k

-4-3=k

-7=k

k=-7 (B)

Answer 2

Answer:

(b) -7

Step-by-step explanation:

2x+3y=k

First plug in -2 for x and -1 for y

2(-2)+3(-1)=k

Then multiply 2 by -2 which equals -4

-4+3(-1)=k

After that multiply 3 by -1 which equal -3

-4+-3=k

Then you can either minus -4 from 3 or add -4 to -3 (you get the same answer from both)

-4-3=k

-4+-3=k

-4 minus 3 equals -7. -4 plus -3 equals -7

-4-3= -7

-4+-3= -7

Which means k equals -7

k=-7 (b)