In one sentence, describe what the following article is about: It doesn’t matter which equation you decide to work with or even which variable you choose to solve for, as you should find the same solution no matter what. However, you do want to make the process as simple as possible. You should choose the equation that you think will be easiest to work with. For instance, if there is an equation where one of the coefficients is 1, such as x - 3y = 7, you would choose that as it will be easy to solve for ‘x’. For example, let’s say our equations are:  x - 2y = 10 (equation A) and -3x -4y = 10 (equation B). You would choose to work with x - 2y = 10 because the coefficient of x in this equation is 1. Solving for x in equation A would meaning adding 2y to both sides. Therefore, x = 10 + 2y. For this step, you will need to insert (or substitute) your solution for ‘x’ into the other solution that you did not work with. This will allow you to find the other variable, in this case ‘y’. Let’s try it: Insert the ‘x’ of equation B into equation A: -3(10 + 2y) -4y = 10. You can see that we have taken ‘x’ out of the equation and inserted what ‘x’ equals. Now that you have removed one of the variables from the equation, you can solve for the other variable. This is is simply solving a regular one-variable linear equation. Let’s solve ours:  -3(10 + 2y) -4y = 10 so -30 -6y -4y = 10. Combine the y’s: -30 - 10y = 10. Move the -30 over to the other side: -10y = 40. Solve for y: y = -4. To do this, plug your findings for ‘y’, or the first variable, into one of the equations. Then solve for the other variable, in this case ‘x’. Let’s try it:  Solve for ‘x’ in equation A by plugging in y = -4: x - 2(-4) = 10. Simply the equation: x + 8 = 10. Solve for x: x = 2. Plug both of the variables into each equation to make sure that they create true equations. Let’s see if ours work:  Equation A: 2 - 2(-4) = 10 is TRUE. Equation B: -3(2) -4(-4) = 10 is TRUE.
Summary: Begin by solving one equation for either variable. Substitute your findings in Step 1 into the other equation. Solve for the other variable. Solve the second variable. Double check that the variables you have found work for both equations.

Problem: Article: Mix 2 tablespoons (30 ml) of olive oil with 2 cloves of garlic that's been minced in a small saucepan. Heat the mixture over medium heat until the garlic starts to sizzle, which should take approximately 3 to 5 minutes. You can add half a small onion that's been diced to the pan for extra flavor in the sauce. Once the garlic has started to sizzle, add a 28-ounce (794 g) can of crushed tomatoes. Mix until the ingredients are well combined, and then allow the sauce to simmer until it becomes thick, which should take approximately 15 minutes.  Stir the sauce occasionally while it's simmering to ensure that it cooks evenly and doesn't scorch the bottom of the pan. If desired, you can mix dried oregano, dried basil, crushed red pepper flakes, salt, and pepper into the sauce before you simmer it. Add the herbs and seasoning to taste. Because crushed tomatoes don't usually come in smaller cans, this recipe is going to make more sauce that you need for a single pizza. If you're only making one pizza, freeze the leftover sauce in an airtight container for the next time. When the sauce has thickened, remove the saucepan from the heat. Set it aside to allow the sauce to cool -- you don't want it to be hot when you start assembling the pizza. If you're short on time, you don't have to make the sauce for the pizza. Instead, use your favorite jarred pizza sauce or tomato-based pasta sauce.
Summary:
Combine the olive oil and garlic in a saucepan. Stir in the tomatoes, and simmer until the sauce thickens. Remove the sauce from the heat and set aside.