How do i get the answer to this math problem n + 7 < -3 what is the formula for the math problem

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

The longer leg of a 30-60-90 trangle is 18

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?