Beginning Algebra
No, because 7 + 3 − 2 does not equal 19 and the arithmetic is inconsistent with the required substitution.
Yes. Substituting 3 gives 7 · 3 − 2 = 19, so t = 3 satisfies the equation.
No. Substituting 3 yields 7 · 3 − 2 = 12, which is not 19, so it is not a solution.
Yes, because multiplying by 3 will always give a result greater than 18 for coefficient 7, implying the equation holds.