What is another way to solve system if equations instead of substitution?

Two 2-digit numbers can be made from the digits 1, 2, 3 and 4 What should these numbers be so that their: a) product is as large as possible b) difference is as large as possible c) sum is as large as possible

What is the difference? 60-30=

If the outside temperature ranges from - 5 degrees c to 40 degrees c, find the range in degrees fahrenheit.

Line j is a straight line. Line j is a straight line. 2 lines come out of the line to form 4 angles. From top left, clockwise, the angles are: x, y, z, w.

Meg uses 1/4 stick of butter thst means there is 3/4 stick left how can I write the 3/4 as the unit fraction

Dr. Barber ordered 121 syringes and 53 needles. In total, how many items did Dr. Barber ordered

Jaime wants to know how fast she can type, so she times herself as she types a paper. The paper has 442 words in it, and Jaime types it in 13 minutes. What is her typing rate, in words per minute?

How can one fourthx - 3 = one halfx + 8 be set up as a system of equations?

Chris invests $2,200 into three accounts that pay 6%, 8% and 9% in annual interest. He has three times as much invested at 9% as he does at 6%. If his total interest for the year is $178, how much is invested at each rate?

If AC = 12 and BC = 13, find AB.