Find factored form of -7y-y^2=0

-y(y + 7) = 0

y = 0

y = -7

Step-by-step explanation:

-7y – y^2=0

y(-7-y) = 0

[y can be factored out because -7y and y² are both multiplied by y, -7y and -y² = -7(y) and -y(y). They have a common variable factor of y]

-y(7 + y) = 0

[-1 can also be factored out because -7 and -y both have a negative]

-y(7 + y) = 0 → -y = 0 and (7 + y) = 0.

-y = 0 → -y÷-1 = 0÷-1 → y = 0

(7 + y) = 0 → 7 + y – 7 = 0 – 7 → y = -7

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

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