7) Brenda spent $19 on a magazine and some
erasers. If the magazine cost $4 and each
eraser cost $5, then how many erasers did
she buy?

ANSWER :

she bought 3 erasers

EXPLANATION :

By subtracting the price payed for the magazine with the total you spent you get $15

example. 19 - 4 = 15

then divide the remaining with the price of the erasers

example. 15 ÷ 5 = 3

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.

p ÷ r = tan(x)

step-by-step explanation:

given that there is a figure below shows a right triangle: a right triangle is shown with hypotenuse equal to q units and the length of the legs equal to p units and r units.

graph is missing so i will create the graph as per given information.

the angle between the legs having lengths p units and q units is y degrees. the angle between the legs having lengths r units and q units is x degrees.

now we need to find about what is p ÷ r equal to.

so we can use trigonometric ratio tan(x)=[altitude]/[base] to find the value of p ÷ r, because p is the altitude and r is the base.

p ÷ r=tan(x)

hence final answer is p ÷ r=tan(x).