Hi how do I solve this simultaneous equation
1 answer:
Answer:
M (-3, -5/2)
N (3, -1)
Step-by-step explanation:
Solve the first equation for x.
4y = x − 7
x = 4y + 7
Substitute into the second equation.
x² + xy = 4 + 2y²
(4y + 7)² + (4y + 7)y = 4 + 2y²
Simplify.
16y² + 56y + 49 + 4y² + 7y = 4 + 2y²
18y² + 63y + 45 = 0
2y² + 7y + 5 = 0
Factor.
(y + 1) (2y + 5) = 0
y = -1 or -5/2
Plug back into the first equation to find x.
x = 4(-1) + 7 = 3
x = 4(-5/2) + 7 = -3
M (-3, -5/2)
N (3, -1)
You might be interested in
Answer:
9
Step-by-step explanation:
if she has 14 and then spends 5 she will have 9. 4-5=9
Answer:
x=19.998
y=3.333
Step-by-step explanation:
5x+6y=50
-x+6y=26
6y=26+x
x=26-6y
5(26-6y)+6y=50
130-30y+6y=50
130-50=30y-6y
80=24y
y= 3.333
x=26-6y
x=26-(6×3.333)
x=19.998
It would simply be written as 9j. Hope it helps! :)
Answer:
Simple. It's dividing the number by 1,000.
Step-by-step explanation:
Moving the decimal to the left results in a smaller number and moving it to the right makes it bigger.
Answer:
it 28
Step-by-step explanation:
took the test :)
