superman10 superman10

01-04-2016
Mathematics

contestada

the sum of two numbers is 30 & their difference is 12.

Respuesta :

apologiabiology apologiabiology

01-04-2016

x+y=30
x-y=12
add them together

x+y=30
x-y=12+
2x+0y=42

2x=42
divide 2
x=21

subsitute
x+y=30
21+y=30
subtrat 21
y=9

number sare 21 and 9

Answer Link

graceh2426 graceh2426

01-04-2016

The answer is 21 and 9. You can use guess and check to solve this. If you add 21 and 9, the sum is 30, and if you subtract 9 from 21, the difference is 12.

Answer Link

Otras preguntas

what is the lcf of 4 and 5

Part A. Solve the following problem. What is the last digit of 2^1999? Part B. Write up a solution to the problems above using the following five step proce

Find the value of 2n-3 – 4 =10

bakit nanakop ang kanlurang asy a

Dans chaque cas réduire l'expression 2x-3+8-4x+x²

Progression is... the training load expressed as resistance, speed or heart rate a gradual increase in one or more of the FITT variables to create an overload e

Simplify much as possible

WILL GIVE BRAINLIEST IF ANSWERED FAST!!!

explain how trade leads to increased interdependence between countries

A curva (ou fronteira) de possibilidades de produção (CPP) expressa a capacidade máxima de produção da sociedade, supondo pleno emprego dos recursos ou fatores