Topic 5 Review of Systems (19 questions) -- Quesiton 15

Question

Solve the system using addition.

8x+6y=-3

-9x+y=52

__________

Answer 1

-9x + y = 52

multiply by 6

-54x + 6y = 312

subtract

8x + 6y = -3

to get

-62x = 315

x = 315/-62 = -315/62 = about - 5.08

y = 52+9x = 52 +9(-315/62) = (3224 - 2835)/62 = 389/62 = about 6.27

8x+6y =-3

8(-5.08)+ 6(6.27) = -40.64 +37.62 = about -3

-9(-5.08) + 6.27 = 45.72 + 6.27 = about 52

x=-315/62 = about -5.08

, y= 389/62 = about 6.27