James used substitution to solve this system of equations which equation could be the result of his first step

2x+3y=12 y=x+1.5

a. y=2x+3y

b. y=2x+3y+1.5

c. 2x+3 (x+1.5) = 12

d. 2x+3x+1.5=12

In 10⁵, the number 10 is the?

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