Answer:
(1,-5)
Step-by-step explanation:
C/a is the amount they bought so it would be 0.99*c or .99 times the amount they bought same goes to .79a
Answer:
The gradient is 1
Step-by-step explanation:
Equation of a line is y = mx + c
where
m is the gradient
c is the y intercept
first write the equation in the formula above
That's
y = x + 2
the coefficient of x is 1
so the gradient is 1
Hope this helps you
Answer:
B: {(3,1), (7,9)}
Step-by-step explanation:
For equation 2x-y=5, we can isolate y, so it's easier to solve later:
y = 2x - 5
y = (x - 4)^2
Now, notice that both equations are equal to y, so we can set them equal to each other:
(x-4)^2 = 2x-5
x^2-8x+16 = 2x - 5
x^2-10x+21=0
Now, we can factorize by finding 2 numbers that multiply to 21 and add up to -10:
(x-3)(x-7)=0
x=3 or x=7
Since B is the only one with the x values of 3 and 7, the answer must be B.
But to further check our answer, we can plug x back to any of the equations above to check for y:
(3-4)^2 = 1
(7-4)^2 = 9
Therefore, we can confirm that the answer is B.
Answer: y = 12 - 3x
Step-by-step explanation:
Move "x" to the other side.
y = 12 - 3x
