What does 15=-3y+21x in slope intercept form

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6