What number is equivalent to 15 and 25

Yvaries directly as x. y =90 when x=6. find y when x=13

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13

Given: x - 4x > 0, then the solution set in interval notation is: (-2, 0) true o false