Question

2x - 1y = -9
y = - 5 - 5x

Answer 1

B. −19

Explanation:

Multiply both sides of the equation by y , and then isolate the variable.

y−1y

=

10

y−1

=

10y

−1

=

9y

−19

=

y

Divide both sides by 9

Answer 2

x = - 7 and y = 30

Explanation:

2x - y = -9

subtract 2x from either side

-y = -9 - 2x

divide either side by -1

y = 9 + 2x

Plug in 9 + 2x for y

9 + 2x = -5 - 5x

Add 5 to either side and subtract 2x from either side

14 = -2x

divide either side by -2

-7 = x

plug in -7 for x in one of the equations

y = -5 - ( 5 x -7 )

y = -5 - ( - 35)

y = -5 + 35

y = 30

plug in x and y

30 = -5 - ( 5 x -7)

30 = -5 - (-35)

30 = -5 + 35

30 = 30