Question

A: 2x + 8y = 5 B: x + 9y = 10 To solve this system of equations by elimination, what could you multiply equation B by if you want to add the equations together and have a resulting equation with only the y-variable (the x-variable is eliminated)? A) −2 B) 2 C) − 1 2 D) 1 2

Answer 1

Answer :A)-2

Step-by-step explanation: If you multiply B; x + 9y =10 by -2 you will      have -2 x+ -18y= -20. Then when you add B with a 2x + 8y = 5

                                                                                      -2x +-18y=-20

                                                                                      =0 +-10y=-15