Rahul simplified an expression. His work is shown below. 7 (8.5 minus 1.5) + 8 divided by 2 Step 1 7 (7) + 8 divided by 2 Step 2 49 + 8 divided by 2 Step 3 57 divided by 2 Step 4 28.5 Where did Rahul make his first mistake? step 1 step 2 step 3 step 4

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?