Ii dont understand how to solve a system of linear equations using the substitution method

Lily has $18. matt has twice as much of a third of the amount lily has, and carolyn has $23 more than matt has. how much money does carolyn have?

Does 0x = 0 mean you have no solution or infinitely many solutions?

Tim predicts that the amount of rain that falls this year will increase by exactly 20% as compared to last year. If last year it rained 50 inches, how much rain does he predict this year?

If a person lives to be exactly 100 years old, how many leap years will that person see

Is a triangle with angle measure 40°,30°, and 120° possible?

Jerry measured and timed the descent of a diving bell spider in a large fish tank. The spider reached a position 412 412 inches below the surface of the water after descending at a constant rate for 112 112 seconds.

The expression 5/9 (f-32) gives the temperature in degrees celsius for a given temperature in degrees fahrenheit f. find the temperature in degrees celsius that is equivalent to 86 f

The formula for the surface area of a cube is S 5 6x2 where x is the length of one side. Find the length of the side of a cube with a surface area of 150 square inches.

More than 450 students went on a field trip. Ten buses were filled and 5 more students traveled in a car. How many students were on each bus?

The sum of two numbers is 58 the larger number is three more than four times the smaller number find the two numbers