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Q: When do you cross multiply to solve an equation?

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a proportion is an equation. a / b = c / d cross multiply: ad = bc then solve

To solve a proportion, you cross multiply. For example, if this was the proportion: 2/4 = 3/x, you would multiply 2 with x and 4 with 3. The products will be used in your next equation. In this case, your next equation is 2x = 12. Now you want to isolate x, so divide by two for both sides. Your answer will be x = 6.

cross multiply to solve: 100 x 4200 = 87 Y solve for Y by doing 420,000 divided by 87, which equals 4828 (rounded off)

Multiply the top equation by -3 and the bottom equation by 2.

set up a proportion. cross multiply. solve

Multiply both sides of the equation by 7.

Cross multiply then solve for the variable.

multiply the whole equation by the number in the denominator

There is no need. The first equation can be rearranged to a simple equation in just y. Multiply it by 0.2 to solve for y. Substitute the value of y in the second equation and rearrange to get a simple equation in x. Multiply by (1/6) to find x.

determinents - you cross multiply and find the difference.

Multiply by 4

you multiply m n p

I assume that you mean that you are given a differential equation dy/dx and want to solve it. If that is the case, then you would multiply by dx on both sides and then integrate both the left and right sides of the equation.

The short answer, multiply on both sides of the equation by the inverse of the matrix you need to remove. Just like solving 3x = y for x. Multiply on both sides of the equation by 1/3.

Set up your equation 28/x = 112/100 (that's 28 divided by x = 112 divided by 100). Then you can cross-multiply (giving you 2800 = 112x) and solve for x (which in this case is 25).

When applying distributive property to solve an equation, you multiply each term by term. For instance: a(b + c) = ab + ac

The details really depend on the equation. It often helps to multiply all parts of the equation by a common denominator, to get rid of the fractions.

1/3 100/x. Then you cross-multiply.

cross multiply you lazy bumAnother AnswerSet up the equation and solve: x/1.2 = -7 (next divide both sides of the equation by 1.2 to solve for x)x = -5.8333

You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.

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When you have a negative variable in an equation that you are trying to solve for, you multiply each side of the equation by -1. If it is an inequality such as <, you would flip the sign to > and vice versa.

variable equation solve it test it

When I say number, I am also including variables and variables with a coefficient (terms). You Have to Cross-Multiply, and then solve algebraicall

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