Question

. What is the solution of the system? Use substitution.

2x – y = –7
4x – y = –4
(1 point)(–1.5, 4)
(1.5, 10)
(4, –1.5)
(–1.5, –2)
What is the solution of the system? Use elimination.

5x + 7y = 32
8x + 6y = 46
(1 point)(8, 5)
(1, 5)
(7, 0)
(5, 1)

16. Mike and Kim invest $12,000 in equipment to print yearbooks for schools. Each yearbook costs $5.00 to print and sells for $15.00. How many yearbooks must they sell before their business breaks even? (1 point)800 yearbooks
1,200 yearbooks
2,400 yearbooks
1,800 yearbooks

17. A baker has a bag of flour that is 11% wh

Answer 1

DYODHDYODH

Answer 2

1. 2x - y = -7 --> -y = -7 - 2x --> y = 2x + 7
sub 2x + 7 in for y in the 2nd equation...
4x - y = -4
4x - (2x + 7) = -4
4x -2x - 7 = -4
2x = -4 + 7
2x = 3
x = 3/2 = 1.5

now sub 1.5 in for x in the 1st equation
2x - y = -7
2(1.5) - y = -7
3.0 - y = -7
-y = -7 - 3
-y = -10
y = 10

ANSWER : (1.5, 10)

2. 5x + 7y = 32 -->(8)5x + 7y = 32
8x + 6y = 46 -->(-5)8x + 6y = 46
-----------------
40x + 56y = 256 (result of multiplying by 8)
-40x - 30y = - 230 (result of multiplying by -5)
------------------add
26y = 26
y = 26/26
y = 1

now sub 1 in for y in either of the original equations...
5x + 7y = 32
5x + 7(1) = 32
5x + 7 = 32
5x = 32 - 7
5x = 25
x = 5

ANSWER : (5,1)

16. x stands for number of yearbooks sold
12,000 + 5(x) = 10(x)
12,000 = 10x - 5x
12,000 = 5x
12.000/5 = x
2400

ANSWER : 2400 yearbooks.

I can't see the other question...