Question

Find two numbers with a sum of 20 and a difference of 14.

A. 4 and 18

B. –3 and –17

C. 2 and 16

D. 3 and 17

Answer 1

\( \color{Black}{\Rightarrow a + b = 20}\)

\( \color{Black}{\Rightarrow a - b = 14}\)

Answer 2

Solve this system.

Answer 3

Try solving it by elimination

Answer 4

Why dont you just and try to use the solutions and see which yields true?

This just comes accross as lazy...

Answer 5

Use simultaneous equations:

a+b=20
a-b=14

take them away from eachother:

2b=6
b=3

substitute into one of the equations:

a+3=20
a=17

Answer 6

From the sum being 20 alone you can tell the answer is D. Literally zero effort and all I did was sum two numbers for each possibility.

Answer 7

The main thing is learning the algebraic solutions. That is better.

Answer 8

the answer is D

Answer 9

correct :)

Answer 10

thank you

Answer 11

nor problem :)