Answer:
use -9 to multiply the first equation
use -4 to multiply the second equation.
Step-by-step explanation:
5x-4y=28.....eqn (1)×-9
3x-9y=30....eqn(2)×-4
-45x+36y=-252
-(-12x+36y=-120)
therefore, -33x÷33 =-132÷-33
x=4.
substitute (x=4) in any of the equation. I'm just going to use eqn 1.
5x-4y=28
5(4)-4y=28
20-4y=28
-4y =28-20
-4y÷-4 = 8÷-4
y=-2
so, x=4, y=-2
Note: for proof of answers substitute the answers for x and y and see if you have the same result...e.g
5(4)-4(-2)=28.
Answer:
-3x + y = 2
Step-by-step explanation:
The slope is 3. So the coefficient of x is 3.
when x = 1, y = 5.
So 3*1 + c = 5
So c is 2.
So y = 3x + 2
Therefore, taking 3x to the LHS, we get,
-3x + y = 2
Hope it helps ;)
Answer:
see explanation
Step-by-step explanation:
To find the x- intercept let y = 0 in the equation and solve for x
x + 0 = 9
x = 9 ← x- intercept ⇒ (9, 0 )
To find the y- intercept let x = 0 in the equation and solve for y
0 + y = 9
y = 9 ← y- intercept ⇒ (0, 9 )
The car is going at a speed of 50 mph and the motorcycle is going at a speed of 40 mph.
40*2=80
80-30=50
50-40=10
10*2 hours= 20
I hope I helped!
