Answer:
5y -10
Step-by-step explanation:
We can find the value of the desired expression by using substitution for the variables A and B.
3A +2B
= 3(y -4) +2(y +1) . . . . . . using y-4 for A, and y+1 for B
= 3y -12 +2y +2 . . . . . . eliminate parentheses with the distributive property
= (3 +2)y +(-12 +2) . . . . group like terms
= 5y -10
An expression that equals 3A +2B is 5y -10.
_____
Additional comment
The "standard form" of a polynomial expression has the highest-degree term listed first, and others in decreasing order of degree.
