Question

Solve the following system:

y = x + 3
3x + y = 19

A( 4, −7)
B (4, 7)
C (−4, 7)
D (7, 4)

Answer 1

y = x + 3...so sub in x + 3 for y in the other equation

3x + y = 19
3x + x + 3 = 19
4x + 3 = 19
4x = 19 - 3
4x = 16
x = 16/4
x = 4

y = x + 3
y = 4 + 3
y = 7

so ur solution is (4,7) <==

Answer 2

option B
`(4,7)`

Explanation:

we have

`y=x+3` -----> equation A

`3x+y=19` -----> equation B

Substitute equation A in equation B

`3x+[x+3]=19`

`3x+x=19-3`

`4x=16`

`x=4`

Find the value of y

`y=x+3`

`y=4+3=7`

the solution is the point
`(4,7)`