Solve problems with or without a calculator Level 4

linear equations in two variables Given that x and y satisfy the equation 5x + y = 49 and y= 2x, find the value of x and y using an algebraic method. Solve these simultaneous equations using an algebraic method: 3a + 2b = 16, 5a - b=18. Solve graphically the simultaneous equations . x + 3y = 11 and 5x - … ................
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