brians work is shown. where did he make a mistake? choose the first incorrect step in brians work.\nbrians…

brians work is shown. where did he make a mistake? choose the first incorrect step in brians work.\nbrians work\n3k - 6 = 15\nstep 1 - 6 - 6\nstep 2 3k = 9\nstep 3 3k/3 = 9/3\nstep 4 k = 3\nstep 1, because he should not have subtracted 6 to isolate 3k\nstep 2, because 15 - 6 ≠ 9\nstep 3, because he should not have divided by 3 to isolate k\nstep 4, because 3k/3 ≠ k

brians work is shown. where did he make a mistake? choose the first incorrect step in brians work.\nbrians work\n3k - 6 = 15\nstep 1 - 6 - 6\nstep 2 3k = 9\nstep 3 3k/3 = 9/3\nstep 4 k = 3\nstep 1, because he should not have subtracted 6 to isolate 3k\nstep 2, because 15 - 6 ≠ 9\nstep 3, because he should not have divided by 3 to isolate k\nstep 4, because 3k/3 ≠ k

Answer

Explanation:

Step1: Analyze Step 1

To isolate (3k) in the equation (3k - 6=15), we should add (6) to both sides (using the addition property of equality), not subtract (6). The correct operation is (3k-6 + 6=15 + 6).

Step2: Check other steps (for confirmation)

If Step 1 was correct (adding (6) instead of subtracting), then (3k=15 + 6=21). Step 3 (dividing by (3)) is a valid operation to isolate (k) ((k=\frac{21}{3}=7)). But since Step 1 was wrong, subsequent steps are based on an incorrect previous result.

Answer:

Step 1, because he should not have subtracted 6 to isolate (3k)