A boat goes with the river and against the river. From two journeys, can we find the speed of the boat and the speed of the river? Yes, with two equations. Here we solve a pair of equations by drawing, by substitution and by elimination.
3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson
Two lines can cross at one point, never cross, or be the same line. The point where they cross is the answer to both equations.
We write one variable in terms of the other from one equation, and we put it into the second equation.
We add or subtract the equations to remove one variable. Then we use the method to solve problems that are given in words.
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