Pleas answer quickly I need this ASAP.

(2, 3 )

Step-by-step explanation:

- x + 3y = 7 → (1)

x - 4y = - 10 ( add 4y to both sides )

x = 4y - 10 → (2)

Substitute x = 4y - 10 into (1)

- (4y - 10) + 3y = 7 ← distribute parenthesis by - 1

- 4y + 10 + 3y = 7

- y + 10 = 7 ( subtract 10 from both sides )

- y = - 3 ( multiply both sides by - 1 )

y = 3

Substitute y = 3 into (2)

x = 4(3) - 10 = 12 - 10 = 2

solution is (2, 3 )

3x + 4y -25 =0 represents the amount of change sianna should recieve

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1