Tell whether the given number is a solution of each question. ( Must show work for credit) 1. 9 = 2a + 3; 3

2. 5n - (-30) = 5; 7

3. 4.4r - 2.8 = 1.6; 1

Answer/Step-by-step explanation:

1. ; 3

Let's solve for a.

(subtraction property of equality)

(division property of equality)

Therefore, 3 is a solution to 9 = 2a + 3

2. ; 7

(- × - = +)

(Subtraction property of equality)

(division property of equality)

Therefore, 7 is not a solution of

3. ; 1

Therefore, 1 is a solution of .

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!