13x = 79 ? Can somebody explain #9 b. PLEASE. Please solve using the system of linear equations by elimination.I would love it i
1 answer:
8x + 2y = 44 5x + 2y = 35 Since 2y is already common, there is no need for multiplication. Just reverse the signs on the equation. Like this; 8x + 2y = 44 -5x - 2y = -35 All the additions become subtractions and vice versa. -2y and +2y get cancelled. Leaving; 8x = 44 -5x = -35 Now, subtract again. 8x - 5x = 3x 44 - 35 = 9 So; 3x = 9 x = 9 / 3 x = 3 We found 'x' and now we have to find 'y'. Just substitute. [8 x 3] + 2y = 44 24 + 2y = 44 2y = 44 - 24 2y = 20 y = 20 / 2 y = 10 Now, we re-check; [8 x 3] + [2 x 10] = 44 24 + 20 = 44 Explaining the error for #9b is simply doing the whole sum. Hope this helped! :) I tried my best to explain.
You might be interested in
-2x+14=x²-3x+12 add 2x on both side: 14=x²-x+12 subtract 14 on both side: x²-x-2=0 factor: (x-2)(x+1)=0 x=2 or x=-1 HOPE THIS HELPS AND PLEASE MARK ME AS BRAINIEST AND ADD ME AS A FRIEND
Answer:
7
Step-by-step explanation:
fdgrgeag
Answer:
2
Step-by-step explanation:
Answer:
178
Step-by-step explanation:
1246 over a week, (1246/7) in a day. 178 rocks a day