Can someone just help me with this simultaneous equations with substitution. I’ve asked ten times and no one has helped. Please

Question

asked Oct 18, 2022 129k views

2 Answers

Charlie Stanard · Answer 1 · 2022-10-22T05:49:26+0000

Answer:

$\huge\boxed{\sf Solution\ Set = \{x,y\} = \{1,2\}}$

Explanation:

3x + 4y = 11 ----------------------(1)

x = 15 - 7y ----------------------(2)

Put Eq. (2) in (1)

3(15 - 7y) + 4y = 11

45 - 21y + 4y = 11

45 - 17y = 11

Subtracting 45 to bot sides

-17y = 11 - 45

-17y = -34

Dividing both sides by -17

y = -34 / -17

y = 2

$\rule[225]{225}{2}$

Put y = 2 in Eq. (2)

x = 15 - 7(2)

x = 15 - 14

x = 1

$\rule[225]{225}{2}$

Solution Set = {x,y} = {1,2}

$\rule[225]{225}{2}$

Hope this helped!