1.
a set of equations is given below:
equation s: y = x + 9
equation t: y = 2x + 1
which of the following steps can be used to find the solution to the set of equations? (4 points)
x = 2x + 1
x + 9 = 2x
x + 1 = 2x + 9
x + 9 = 2x + 1
2.
a system of equations is given below:
y = –2x + 1
6x + 2y = 22
which of the following steps could be used to solve by substitution? (4 points)
6x + 2(–2x + 1) = 22
–2x + 1 = 6x + 2y
6(–2x + 1) + 2y = 22
6(y = –2x + 1)
3.
solve the system of equations and choose the correct answer from the list of options.
d + e = 12
–d + e = –8
label the ordered pair as (d, e). (4 points)
(0, 0)
(2, 10)
(10, 2)
(12, 0)