<PRE><B>Question 634870</B>
1) Prove that if 3/5 x =-9, then x=-15.
You can solve the eqn for x, or sub -15 for x.
(3/5)*-15 = -9
-9 = -9
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Do the others the same way.
2) Prove that if 3x-2=x-8, then x=-3.

3) Prove that if 2(x-3)=8, then x=7.

4) Prove that if 3x-4=1/2 x +6, then x=4.

5) If x=y+3 and y+3=10, then x=10.</PRE>