What is the solution to the system of equations? use the linear combination method.

{3x+y=3

{2x+y=7

enter your answer

(-4,15)

Step-by-step explanation:

Personally I think this works better with substitution, but I'll do it your way.

3x + y = 3

2x + y = 7               Subtract these two equations

x = - 4                      3 - 7 = - 4

3x + y = 3                 Substitute - 4 for x  

3(-4) + y = 3             Combine

-12 + y = 3                Add 12 to both sides

-12 + 12 + y = 3+12  

y = 15

Check

2x + y = 7

2*-4 + 15 = 7

- 8 + 15 = 7

7 = 7

It checks.

answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.

step-by-step explanation:

since we have given that

total annual rainfall a city record = 40 inches

this year, total rainfall recorded = 37.6 inches

number of inches of rainfall   is needed to match the record of 40 inches is given by

hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45