Solve the following system of equations using substitution.

5y = x - 15

-3y = -12x - 9

What is the value of x?

(Enter as a fraction)

Pls an ice cream shop sells 5 times as many cake cones as waffle cones use variable x to represent the number of waffle the ice cream shop sells and use this variable to write an expression for the number of cake cones the ice cream shop sells. enter the expression for the number of cake cones the ice cream shop sells

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Which of the binomials below is a factor of this trinominal? x^2-13+30