Two students went to the school store. Each had a $20 bill. Jacob bought 3 of an item and received change. Quinn bought 7 of the same item and also received change. The total amount of change between them was $25. Write and solve an equation to find which item the students bought. (PLS HELP MEH! PLS I HATE THIS STUFF BUT I LOVE IT MAH TEACHERS STOOPID!)

X= $1.5

Step-by-step explanation:

y=mx +b

Y= total amount they had,  M= the amount they bought,  X= how much the item cost, B= the amount they of change they had left

40= 10x + 25

Subtract 25 from both sides

40-25= 15

15= 10x

divide 10 from both sides

15/10= 1.5

x= 1.5

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b