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1 Isolating a Variable in a Formula. To isolate a particular variable in a formula: 1. Treat all other variables like constants. 2. Isolate the desired variable using the addition and multiplication principle. F Isolate variable using the Addition Principle. • Solve each of the following equations for the indicated variable. 1. x − 5y = 4, for x. 2. A + B + C = 180, for B. F Isolate variable using the Multiplication Principle. • Solve each of the following equations for the indicated variable. 3. I = P rt, for r. 4. P = I 2R, for R. 2 F Isolate variable using the both Principles. • Solve each of the following equations for the indicated variable. 5. 2x − 5y = 10, for y. 6. y = mx + b, for m. 7. x y − = 1, for y. 4 2 9 8. F = C + 32, for C. 5 F Challenge Problem (To Keep you all Off the streets) . . . please work in groups. 9-10 • Solve each of the following equations for the indicated variable. Check your answers. Mm 9. V = h(πr2 − lw), for w. 10. F = G 2 , for m. R