Answer:
15q-4r=62 =
q=62/15+4/15
r=-31/2+15/4q
5q+8r=-86
q=86/5-8/5r
r=43/4-5/8q
Step-by-step explanation:
15q=62+4r
q=62/15+4/15r
-4r=62-15q
r=-31/2+15/4q
Answer:
q = 6
r = 7
Step-by-step explanation:
1. change equation
15q - 4r = 62
-3 ( 5q + 8r = 86 ) << Multiply by -3 to make 5q into -15q
This equals -15q - 24r = -258
2. Add equations
( 15q - 4r = 62 ) + ( -15q - 24r = -258 )
^^15q + ( -15q ) equals no q, so there is no q anymore.
3. Find r
-28r = 198 << divide -28 from both sides to get r by itself
r = 7
4. Find q
<< use one of the original equations to solve>>
(we're using 15q – 4r = 62)
<<substitute r with 7>>
15q - 4 ( 7 ) = 62 << -4 x 7 = -28
15q -28 = 62 << add 28 to both sides
15q = 90 << divide out 15 from both sides
q = 6
