Question

Need some help with this question

it is multiple choice
please give me a decent response not a silly one ​

Answer 1

C.

Explanation:

linear equation:

y = mx + c

m = slope or gradient

c = y-intercept, the point at which the line meets the y-axis (vertical axis)

The y-intercept of y = 10 - 2.5x is equal to 10

**in the above equation, the slope and the y-intercept have been switched. The slope can be identified as it has an x beside it, so 10 is the y-intercept

Just looking at the equation we can already rule out B, D and E. So now it's up to A and C.

Next is the slope, we can see the slope/gradient is -2.5. It is a negative value which means the line must be sloping downwards. The line in graph C is sloping down (starts high on the left and as it moves the right goes down).

So answer C. is the graph of the equation y = 10 - 2.5x and there was no need for complicated maths!

Answer 2

Hello,

Answer is C

Explanation:

y=-2.5*x+10: function decreases

if x=0 then y=-2.5*0+10=10 ==> (0,10)

if x=4 then y=-2.5*4+10=0 ==> (4,0)

Answer C