Question

Solve each system of equations by using elimination.













a.


3.19, 0


c.


1.57, –0.81




b.


3.19, –0.81


d.


1.38, 3.19

Answer 1

where is the system of equations ?

Answer 2

8p+8q=19
5p-5q=20 @kelliegirl33

Answer 3

8p + 8q = 19 -->(-5)
5p - 5q = 20 --> (8)
-------------------
-40p - 40q = - 95 (result of multiplying by -5)
40p - 40q = 160 (result of multiplying by 8)
-------------------add
-80q = 65
q = -65/80
q = - 0.8125 or - 0.81

now sub -0.81 in for q in any of the beginning equations
5p - 5q = 20
5p - 5(-0.81) = 20
5p + 4.05 = 20
5p = 20 - 4.05
5p = 15.95
p = 15.95/5
p = 3.19

check...
8p + 8q = 19
8(3.19) + 8(-0.81) = 19
25.52 - 6.48 = 19
19.04 rounds to 19 = 19 (correct)

p = 3.19
q = 0.81