Question

The sum of two numbers is 20 and their difference is 2, write system of linear equations and solve the?

Answer 1

10 and 4 sorry

Answer 2

x + y = 20
x - y = 2
-----------add
2x = 22
x = 11

x + y = 20
11 + y = 20
y = 20 - 11
y = 9

check...
x + y = 20
11 + 9 = 20
20 = 20 (correct)

check...
x - y = 2
11 - 9 = 2
2 = 2 (correct)

any questions ?

Answer 3

wait...what is the 10 and 4 ? Is it supposed to be x + y = 10 and x - y = 4 ??

Answer 4

yes

Answer 5

x + y = 10
x - y = 4
-----------add
2x = 14
x = 7

x + y = 10
7 + y = 10
y = 10 - 7
y = 3

check...
x + y = 10
7 + 3 = 10
10 = 10 (correct)

check..
x - y = 4
7 - 3 = 4
4 = 4 (correct)

Answer 6

any questions ?

Answer 7

how would i graph it

Answer 8

I am sorry...I am not good at graphing.
I do know that to find the x intercept of a line is to sub in 0 for y and to find the y intercept, sub in 0 for x.