29 !

mariah earns $32.75 per week working as a pet sitter. she worked as a pet sitter for 2 weeks. she previously saved $70.99 in allowance money. she spent $12.25 of her total earning to buy video games. mariah put 1 over 4 of the remaining money in her savings account. mariah used the following steps to find the total money she put in her savings account:

step 1: [($32.75 ⋅ 2) + $70.99 − $12.25] ⋅ 1 over 4

step 2: [$65.5 + $70.99 − $12.25] ⋅ 1 over 4

step 3: $136.49 − $3.0625 = $133.4275

in which step did mariah first make an error? explain, using words, how mariah can correct her error.

1.true 2.false? ? i think. .

step-by-step explanation:

{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